Document and Entity Information	6 Months Ended
Document and Entity Information	Jun. 30, 2013	Jul. 26, 2013
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Trading Symbol	ED
Entity Registrant Name	CONSOLIDATED EDISON INC
Entity Central Index Key	0001047862
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		292,872,896
Consolidated Edison Co of New York Inc [Member]
Document Information [Line Items]
Entity Registrant Name	CONSOLIDATED EDISON CO OF NEW YORK INC
Entity Central Index Key	0000023632
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer

CONSOLIDATED INCOME STATEMENT (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
OPERATING REVENUES
Electric	$ 2,018	$ 2,090	$ 3,977	$ 3,952
Gas	366	300	1,108	945
Steam	118	83	450	346
Non-utility	316	298	468	606
TOTAL OPERATING REVENUES	2,818	2,771	6,003	5,849
OPERATING EXPENSES
Purchased power	768	729	1,475	1,510
Fuel	58	46	205	153
Gas purchased for resale	118	62	368	258
Other operations and maintenance	776	790	1,606	1,539
Depreciation and amortization	255	236	506	469
Taxes, other than income taxes	457	433	931	884
TOTAL OPERATING EXPENSES	2,432	2,296	5,091	4,813
OPERATING INCOME	386	475	912	1,036
OTHER INCOME (DEDUCTIONS)
Investment and other income	7	2	10	10
Allowance for equity funds used during construction	1	2	1	2
Other deductions	(6)	(6)	(8)	(10)
TOTAL OTHER INCOME (DEDUCTIONS)	2	(2)	3	2
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	388	473	915	1,038
INTEREST EXPENSE
Interest on long-term debt	145	149	288	295
Other interest	6	5	142	10
Allowance for borrowed funds used during construction		(1)	(1)	(1)
NET INTEREST EXPENSE	151	153	429	304
INCOME BEFORE INCOME TAX EXPENSE	237	320	486	734
INCOME TAX EXPENSE	65	106	122	240
NET INCOME	172	214	364	494
Preferred stock dividend requirements of subsidiary				(3)
Cumulative preferred dividends				(3)
NET INCOME FOR COMMON STOCK	172	214	364	491
Net income for common stock per common share-basic	$ 0.59	$ 0.73	$ 1.24	$ 1.68
Net income for common stock per common share-diluted	$ 0.59	$ 0.73	$ 1.24	$ 1.67
DIVIDENDS DECLARED PER SHARE OF COMMON STOCK	$ 0.615	$ 0.605	$ 1.230	$ 1.210
AVERAGE NUMBER OF SHARES OUTSTANDING-BASIC (IN MILLIONS)	292.9	292.9	292.9	292.9
AVERAGE NUMBER OF SHARES OUTSTANDING-DILUTED (IN MILLIONS)	294.3	294.4	294.3	294.4
CECONY [Member]
OPERATING REVENUES
Electric	1,872	1,961	3,686	3,696
Gas	331	265	991	828
Steam	118	83	450	346
TOTAL OPERATING REVENUES	2,321	2,309	5,127	4,870
OPERATING EXPENSES
Purchased power	469	504	924	950
Fuel	58	46	205	154
Gas purchased for resale	98	50	317	219
Other operations and maintenance	676	693	1,417	1,339
Depreciation and amortization	235	221	468	439
Taxes, other than income taxes	439	415	890	844
TOTAL OPERATING EXPENSES	1,975	1,929	4,221	3,945
OPERATING INCOME	346	380	906	925
OTHER INCOME (DEDUCTIONS)
Investment and other income	3	1	5	5
Allowance for equity funds used during construction		1	1	1
Other deductions	(5)	(5)	(7)	(8)
TOTAL OTHER INCOME (DEDUCTIONS)	(2)	(3)	(1)	(2)
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	344	377	905	923
INTEREST EXPENSE
Interest on long-term debt	129	135	256	266
Other interest	5	5	11	10
Allowance for borrowed funds used during construction		(1)	(1)	(1)
NET INTEREST EXPENSE	134	139	266	275
INCOME BEFORE INCOME TAX EXPENSE	210	238	639	648
INCOME TAX EXPENSE	57	75	209	209
NET INCOME	153	163	430	439
Cumulative preferred dividends				(3)
NET INCOME FOR COMMON STOCK	$ 153	$ 163	$ 430	$ 436

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
NET INCOME	$ 172	$ 214	$ 364	$ 494
OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAXES
Pension plan liability adjustments, net	2	(1)	5	6
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAXES	2	(1)	5	6
COMPREHENSIVE INCOME	174	213	369	500
Preferred stock dividend requirements of subsidiary				(3)
COMPREHENSIVE INCOME FOR COMMON STOCK	174	213	369	497
CECONY [Member]
NET INCOME	153	163	430	439
OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAXES
Pension plan liability adjustments, net		(2)		(2)
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAXES		(2)		(2)
COMPREHENSIVE INCOME	153	161	430	437
Preferred stock dividend requirements of subsidiary				$ (3)

CONSOLIDATED STATEMENT OF CASH FLOWS (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
OPERATING ACTIVITIES
NET INCOME	$ 364	$ 494
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	506	469
Deferred income taxes	(134)	146
Rate case amortization and accruals	19	22
Common equity component of allowance for funds used during construction	(1)	(2)
Net derivative (gains)/losses	30	(31)
Pre-tax gain on the termination of a LILO transaction	(49)
Other non-cash items (net)	154	(85)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable - customers, less allowance for uncollectibles	11	89
Special deposits	(335)
Materials and supplies, including fuel oil and gas in storage	9	19
Other receivables and other current assets	2	17
Prepayments	40	(6)
Accounts payable	(121)	(89)
Pensions and retiree benefits obligations	467	483
Pensions and retiree benefits contributions	(361)	(450)
Superfund and environmental remediation costs (net)	(6)	1
Accrued taxes	160	(34)
Accrued interest	124	19
Deferred charges, noncurrent assets and other regulatory assets	(34)	116
Deferred credits and other regulatory liabilities	79	73
Other assets	66
Other liabilities	(17)	(4)
NET CASH FLOWS FROM OPERATING ACTIVITIES	973	1,247
INVESTING ACTIVITIES
Utility construction expenditures	(1,114)	(1,030)
Cost of removal less salvage	(93)	(85)
Non-utility construction expenditures	(129)	(43)
Increase in restricted cash	(2)
Proceeds from grants related to renewable energy investments	18	25
Net investment in Pilesgrove solar project and other		28
Proceeds from the termination of a LILO transaction	108
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(1,212)	(1,105)
FINANCING ACTIVITIES
Net proceeds of short-term debt	753	800
Preferred stock redemption		(239)
Issuance of long-term debt	919	400
Retirement of long-term debt	(706)	(2)
Issuance of common shares for stock plans, net of repurchases	(2)	(12)
Debt issuance costs	(12)	(4)
Common stock dividends	(360)	(349)
Preferred stock dividends		(3)
NET CASH FLOWS FROM FINANCING ACTIVITIES	592	591
CASH AND TEMPORARY CASH INVESTMENTS:
NET CHANGE FOR THE PERIOD	353	733
BALANCE AT BEGINNING OF PERIOD	394	648
BALANCE AT END OF PERIOD	747	1,381
Cash paid during the period for:
Interest	281	281
Income taxes	27	45
CECONY [Member]
OPERATING ACTIVITIES
NET INCOME	430	439
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	468	439
Deferred income taxes	191	106
Rate case amortization and accruals	19	22
Common equity component of allowance for funds used during construction	(1)	(1)
Other non-cash items (net)	(25)	(37)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable - customers, less allowance for uncollectibles	22	63
Materials and supplies, including fuel oil and gas in storage	2	18
Other receivables and other current assets	18	(8)
Prepayments	(8)	5
Accounts payable	(119)	(57)
Pensions and retiree benefits obligations	435	422
Pensions and retiree benefits contributions	(361)	(450)
Superfund and environmental remediation costs (net)	(4)	(1)
Accrued taxes	(114)	(3)
Accrued interest	4	7
Deferred charges, noncurrent assets and other regulatory assets	(11)	59
Deferred credits and other regulatory liabilities	68	70
Other liabilities	29	12
NET CASH FLOWS FROM OPERATING ACTIVITIES	1,043	1,105
INVESTING ACTIVITIES
Utility construction expenditures	(1,062)	(974)
Cost of removal less salvage	(89)	(83)
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(1,151)	(1,057)
FINANCING ACTIVITIES
Net proceeds of short-term debt	809	800
Preferred stock redemption		(239)
Issuance of long-term debt	700	400
Retirement of long-term debt	(700)
Debt issuance costs	(7)	(4)
Dividend to parent	(364)	(341)
Preferred stock dividends		(3)
NET CASH FLOWS FROM FINANCING ACTIVITIES	438	613
CASH AND TEMPORARY CASH INVESTMENTS:
NET CHANGE FOR THE PERIOD	330	661
BALANCE AT BEGINNING OF PERIOD	353	372
BALANCE AT END OF PERIOD	683	1,033
Cash paid during the period for:
Interest	251	252
Income taxes	$ 104	$ 45

CONSOLIDATED BALANCE SHEET (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash and temporary cash investments	$ 747	$ 394
Special deposits	405	70
Accounts receivable-customers, less allowance for uncollectible accounts	1,211	1,222
Other receivables, less allowance for uncollectible accounts	310	228
Accrued unbilled revenue	487	516
Fuel oil, gas in storage, materials and supplies, at average cost	321	330
Prepayments	119	159
Regulatory assets	56	74
Deferred tax assets - current	283	296
Other current assets	164	162
TOTAL CURRENT ASSETS	4,103	3,451
INVESTMENTS	313	467
NON-UTILITY PLANT
Non-utility property, less accumulated depreciation	486	555
Construction work in progress	102	83
NET PLANT	27,542	26,939
UTILITY PLANT, AT ORIGINAL COST
General	2,295	2,302
TOTAL	32,512	31,847
Less: Accumulated depreciation	6,837	6,573
Net	25,675	25,274
Construction work in progress	1,279	1,027
NET UTILITY PLANT	26,954	26,301
OTHER NONCURRENT ASSETS
Goodwill	429	429
Intangible assets, less accumulated amortization of $4 in 2013 and 2012	4	2
Regulatory assets	9,304	9,705
Other deferred charges and noncurrent assets	227	216
TOTAL OTHER NONCURRENT ASSETS	9,964	10,352
TOTAL ASSETS	41,922	41,209
CURRENT LIABILITIES
Long-term debt due within one year	483	706
Notes payable	1,400	539
Accounts payable	997	1,215
Customer deposits	310	304
Accrued taxes	322	162
Accrued interest	277	153
Accrued wages	93	94
Fair value of derivative liabilities	31	47
Uncertain income tax liabilities	13	44
Regulatory liabilities	88	183
Other current liabilities	490	498
TOTAL CURRENT LIABILITIES	4,504	3,945
NONCURRENT LIABILITIES
Obligations under capital leases	2	2
Provision for injuries and damages	144	149
Pensions and retiree benefits	4,333	4,678
Superfund and other environmental costs	522	545
Asset retirement obligations	162	159
Fair value of derivative liabilities	32	31
Uncertain income tax liabilities	3
Other noncurrent liabilities	117	125
TOTAL NONCURRENT LIABILITIES	5,315	5,689
DEFERRED CREDITS AND REGULATORY LIABILITIES
Deferred income taxes and investment tax credits	8,280	8,372
Regulatory liabilities	1,393	1,202
Other deferred credits	53	70
TOTAL DEFERRED CREDITS AND REGULATORY LIABILITIES	9,726	9,644
LONG-TERM DEBT	10,494	10,062
COMMON SHAREHOLDER'S EQUITY (See Statement of Common Shareholder's Equity)	11,883	11,869
TOTAL LIABILITIES AND SHAREHOLDER'S EQUITY	41,922	41,209
CECONY [Member]
CURRENT ASSETS
Cash and temporary cash investments	683	353
Special deposits	86	65
Accounts receivable-customers, less allowance for uncollectible accounts	1,086	1,108
Other receivables, less allowance for uncollectible accounts	88	106
Accrued unbilled revenue	390	406
Accounts receivable from affiliated companies	46	61
Fuel oil, gas in storage, materials and supplies, at average cost	283	285
Prepayments	89	81
Regulatory assets	51	60
Deferred tax assets - current	179	193
Other current assets	58	69
TOTAL CURRENT ASSETS	3,039	2,787
INVESTMENTS	232	207
NON-UTILITY PLANT
Non-utility property, less accumulated depreciation	6	6
NET PLANT	25,373	24,745
UTILITY PLANT, AT ORIGINAL COST
General	2,118	2,126
TOTAL	30,434	29,801
Less: Accumulated depreciation	6,253	6,009
Net	24,181	23,792
Construction work in progress	1,186	947
NET UTILITY PLANT	25,367	24,739
OTHER NONCURRENT ASSETS
Regulatory assets	8,595	8,972
Other deferred charges and noncurrent assets	185	174
TOTAL OTHER NONCURRENT ASSETS	8,780	9,146
TOTAL ASSETS	37,424	36,885
CURRENT LIABILITIES
Long-term debt due within one year	475	700
Notes payable	1,230	421
Accounts payable	799	989
Accounts payable to affiliated companies	20	22
Customer deposits	298	292
Accrued taxes	27	37
Accrued taxes to affiliated companies	111	215
Accrued interest	137	133
Accrued wages	86	84
Fair value of derivative liabilities	23	28
Uncertain income tax liabilities	7	36
Regulatory liabilities	54	145
Other current liabilities	424	410
TOTAL CURRENT LIABILITIES	3,691	3,512
NONCURRENT LIABILITIES
Obligations under capital leases	2	2
Provision for injuries and damages	137	141
Pensions and retiree benefits	3,877	4,220
Superfund and other environmental costs	413	433
Asset retirement obligations	162	158
Fair value of derivative liabilities	10	11
Other noncurrent liabilities	110	115
TOTAL NONCURRENT LIABILITIES	4,711	5,080
DEFERRED CREDITS AND REGULATORY LIABILITIES
Deferred income taxes and investment tax credits	7,721	7,452
Regulatory liabilities	1,269	1,077
Other deferred credits	49	67
TOTAL DEFERRED CREDITS AND REGULATORY LIABILITIES	9,039	8,596
LONG-TERM DEBT	9,365	9,145
COMMON SHAREHOLDER'S EQUITY (See Statement of Common Shareholder's Equity)	10,618	10,552
TOTAL LIABILITIES AND SHAREHOLDER'S EQUITY	37,424	36,885
Electric Transmission [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	22,823	22,376
Electric Transmission [Member] \| CECONY [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	21,505	21,079
Gas Transmission [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	5,288	5,120
Gas Transmission [Member] \| CECONY [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	4,705	4,547
Steam Plant [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	2,106	2,049
Steam Plant [Member] \| CECONY [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	$ 2,106	$ 2,049

CONSOLIDATED BALANCE SHEET (Parenthetical) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Accounts receivable - customers, allowance for uncollectible accounts	$ 93	$ 94
Other receivables, allowance for uncollectible accounts	8	10
Non-utility property, accumulated depreciation	78	68
Intangible assets, accumulated amortization	4	4
CECONY [Member]
Accounts receivable - customers, allowance for uncollectible accounts	87	87
Other receivables, allowance for uncollectible accounts	7	9
Non-utility property, accumulated depreciation	$ 25	$ 25

CONSOLIDATED STATEMENT OF COMMON SHAREHOLDERS' EQUITY (USD $) In Millions, except Share data	Total	CECONY [Member]	Common Stock [Member]	Common Stock [Member] CECONY [Member]	Additional Paid-In Capital [Member]	Additional Paid-In Capital [Member] CECONY [Member]	Retained Earnings [Member]	Retained Earnings [Member] CECONY [Member]	Treasury Stock [Member]	Capital Stock Expense [Member]	Capital Stock Expense [Member] CECONY [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Accumulated Other Comprehensive Income/(Loss) [Member] CECONY [Member]	Repurchased Con Edison Stock [Member] CECONY [Member]
BALANCE at Dec. 31, 2011	$ 11,436	$ 10,218	$ 32	$ 589	$ 4,991	$ 4,234	$ 7,568	$ 6,429	$ (1,033)	$ (64)	$ (64)	$ (58)	$ (8)	$ (962)
BALANCE (In Shares) at Dec. 31, 2011			292,888,521	235,488,094					23,194,075
Net income for common stock	277						277
NET INCOME		276						276
Common stock dividend	(177)	(171)					(177)	(171)
Issuance of common shares for stock plans, net of repurchases	(2)								(2)
Cumulative preferred dividends		(3)						(3)
Issuance of common shares for stock plans, net of repurchases (In Shares)			(7,225)						7,225
Preferred stock redemption	4	4								4	4
Other comprehensive income	7											7
BALANCE at Mar. 31, 2012	11,545	10,324	32	589	4,991	4,234	7,668	6,531	(1,035)	(60)	(60)	(51)	(8)	(962)
BALANCE (In Shares) at Mar. 31, 2012			292,881,296	235,488,094					23,201,300
BALANCE at Dec. 31, 2011	11,436	10,218		589	4,991	4,234								(962)
BALANCE (In Shares) at Dec. 31, 2011				235,488,094
Net income for common stock	491	436
NET INCOME	494	439
Cumulative preferred dividends	(3)	(3)
BALANCE at Jun. 30, 2012	11,579	10,314		589	4,991	4,234					(60)			(962)
BALANCE (In Shares) at Jun. 30, 2012				235,488,094
BALANCE at Mar. 31, 2012	11,545	10,324	32	589	4,991	4,234	7,668	6,531	(1,035)	(60)		(51)	(8)	(962)
BALANCE (In Shares) at Mar. 31, 2012			292,881,296	235,488,094					23,201,300
Net income for common stock	214	163					214
NET INCOME	214	163						163
Common stock dividend	(178)	(171)					(178)	(171)
Issuance of common shares for stock plans, net of repurchases	(1)									(1)
Issuance of common shares for stock plans, net of repurchases (In Shares)			1,700						(1,700)
Other comprehensive income	(1)	(2)										(1)	(2)
BALANCE at Jun. 30, 2012	11,579	10,314	32	589	4,991	4,234	7,704	6,523	(1,035)	(61)	(60)	(52)	(10)	(962)
BALANCE (In Shares) at Jun. 30, 2012			292,882,996	235,488,094					23,199,600
BALANCE at Dec. 31, 2012	11,869	10,552	32	589	4,991	4,234	7,997	6,761	(1,037)	(61)	(61)	(53)	(9)	(962)
BALANCE (In Shares) at Dec. 31, 2012			292,871,896	235,488,094					23,210,700
Net income for common stock	192						192
NET INCOME		277						277
Common stock dividend	(180)	(182)					(180)	(182)
Issuance of common shares for stock plans, net of repurchases	5				(2)				7
Issuance of common shares for stock plans, net of repurchases (In Shares)			95,468						(95,468)
Other comprehensive income	3											3
BALANCE at Mar. 31, 2013	11,889	10,647	32	589	4,989	4,234	8,009	6,856	(1,030)	(61)	(61)	(50)	(9)	(962)
BALANCE (In Shares) at Mar. 31, 2013			292,967,364	235,488,094					23,115,232
BALANCE at Dec. 31, 2012	11,869	10,552		589		4,234				(61)	(61)			(962)
BALANCE (In Shares) at Dec. 31, 2012				235,488,094
Net income for common stock	364	430
NET INCOME	364	430
BALANCE at Jun. 30, 2013	11,883	10,618		589		4,234				(61)	(61)			(962)
BALANCE (In Shares) at Jun. 30, 2013				235,488,094
BALANCE at Mar. 31, 2013	11,889	10,647	32	589	4,989	4,234	8,009	6,856	(1,030)	(61)	(61)	(50)	(9)	(962)
BALANCE (In Shares) at Mar. 31, 2013			292,967,364	235,488,094					23,115,232
Net income for common stock	172	153					172
NET INCOME	172	153						153
Common stock dividend	(180)	(182)					(180)	(182)
Issuance of common shares for stock plans, net of repurchases					1				(1)
Issuance of common shares for stock plans, net of repurchases (In Shares)			(4,078)						4,078
Other comprehensive income	2											2
BALANCE at Jun. 30, 2013	$ 11,883	$ 10,618	$ 32	$ 589	$ 4,990	$ 4,234	$ 8,001	$ 6,827	$ (1,031)	$ (61)	$ (61)	$ (48)	$ (9)	$ (962)
BALANCE (In Shares) at Jun. 30, 2013			292,963,286	235,488,094					23,119,310

General	6 Months Ended
General	Jun. 30, 2013
General	General These combined notes accompany and form an integral part of the separate consolidated financial statements of each of the two separate registrants: Consolidated Edison, Inc. and its subsidiaries (Con Edison) and Consolidated Edison Company of New York, Inc. and its subsidiaries (CECONY). CECONY is a subsidiary of Con Edison and as such its financial condition and results of operations and cash flows, which are presented separately in the CECONY consolidated financial statements, are also consolidated, along with those of Con Edison’s other utility subsidiary, Orange and Rockland Utilities, Inc. (O&R), and Con Edison’s competitive energy businesses (discussed below) in Con Edison’s consolidated financial statements. The term “Utilities” is used in these notes to refer to CECONY and O&R. As used in these notes, the term “Companies” refers to Con Edison and CECONY and, except as otherwise noted, the information in these combined notes relates to each of the Companies. However, CECONY makes no representation as to information relating to Con Edison or the subsidiaries of Con Edison other than itself. The separate interim consolidated financial statements of each of the Companies are unaudited but, in the opinion of their respective managements, reflect all adjustments (which include only normally recurring adjustments) necessary for a fair presentation of the results for the interim periods presented. The Companies’ separate interim consolidated financial statements should be read together with their separate audited financial statements (including the combined notes thereto) included in Item 8 of their combined Annual Report on Form 10-K for the year ended December 31, 2012 and their separate unaudited financial statements (including the combined notes thereto) included in Part I, Item 1 of their combined Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2013. Certain prior period amounts have been reclassified to conform to the current period presentation. Con Edison has two regulated utility subsidiaries: CECONY and O&R. CECONY provides electric service and gas service in New York City and Westchester County. The company also provides steam service in parts of Manhattan. O&R, along with its regulated utility subsidiaries, provides electric service in southeastern New York and adjacent areas of northern New Jersey and eastern Pennsylvania and gas service in southeastern New York and adjacent areas of eastern Pennsylvania. Con Edison has the following competitive energy businesses: Consolidated Edison Solutions, Inc. (Con Edison Solutions), a retail energy services company that sells electricity and also offers energy-related services; Consolidated Edison Energy, Inc. (Con Edison Energy), a wholesale energy services company; and Consolidated Edison Development, Inc. (Con Edison Development), a company that develops and participates in infrastructure projects.
CECONY [Member]
General	General These combined notes accompany and form an integral part of the separate consolidated financial statements of each of the two separate registrants: Consolidated Edison, Inc. and its subsidiaries (Con Edison) and Consolidated Edison Company of New York, Inc. and its subsidiaries (CECONY). CECONY is a subsidiary of Con Edison and as such its financial condition and results of operations and cash flows, which are presented separately in the CECONY consolidated financial statements, are also consolidated, along with those of Con Edison’s other utility subsidiary, Orange and Rockland Utilities, Inc. (O&R), and Con Edison’s competitive energy businesses (discussed below) in Con Edison’s consolidated financial statements. The term “Utilities” is used in these notes to refer to CECONY and O&R. As used in these notes, the term “Companies” refers to Con Edison and CECONY and, except as otherwise noted, the information in these combined notes relates to each of the Companies. However, CECONY makes no representation as to information relating to Con Edison or the subsidiaries of Con Edison other than itself. The separate interim consolidated financial statements of each of the Companies are unaudited but, in the opinion of their respective managements, reflect all adjustments (which include only normally recurring adjustments) necessary for a fair presentation of the results for the interim periods presented. The Companies’ separate interim consolidated financial statements should be read together with their separate audited financial statements (including the combined notes thereto) included in Item 8 of their combined Annual Report on Form 10-K for the year ended December 31, 2012 and their separate unaudited financial statements (including the combined notes thereto) included in Part I, Item 1 of their combined Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2013. Certain prior period amounts have been reclassified to conform to the current period presentation. Con Edison has two regulated utility subsidiaries: CECONY and O&R. CECONY provides electric service and gas service in New York City and Westchester County. The company also provides steam service in parts of Manhattan. O&R, along with its regulated utility subsidiaries, provides electric service in southeastern New York and adjacent areas of northern New Jersey and eastern Pennsylvania and gas service in southeastern New York and adjacent areas of eastern Pennsylvania. Con Edison has the following competitive energy businesses: Consolidated Edison Solutions, Inc. (Con Edison Solutions), a retail energy services company that sells electricity and also offers energy-related services; Consolidated Edison Energy, Inc. (Con Edison Energy), a wholesale energy services company; and Consolidated Edison Development, Inc. (Con Edison Development), a company that develops and participates in infrastructure projects.

Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2013

Summary of Significant Accounting Policies

Note A — Summary of Significant Accounting Policies

Earnings Per Common Share

For the three and six months ended June 30, 2013 and 2012, basic and diluted earnings per share (EPS) for Con Edison are calculated as follows:


	For the Three Months Ended June 30,				For the Six Months Ended June 30,
*(Millions of Dollars, except per share amounts/Shares in Millions)*	2013		2012		2013		2012
Net income for common stock		$ 172		$ 214		$ 364		$ 491
Weighted average common shares outstanding – basic		292.9		292.9		292.9		292.9
Add: Incremental shares attributable to effect of potentially dilutive securities		1.4		1.5		1.4		1.5
Adjusted weighted average common shares outstanding – diluted		294.3		294.4		294.3		294.4
Net Income for common stock per common share – basic		$ 0.59		$ 0.73		$ 1.24		$ 1.68
Net Income for common stock per common share – diluted		$ 0.59		$ 0.73		$ 1.24		$ 1.67

The computation of diluted EPS for the three and six months ended June 30, 2013 and 2012 excludes immaterial amounts of performance share awards which were not included because of their anti-dilutive effect.

Changes in Accumulated Other Comprehensive Income by Component

For the three and six months ended June 30, 2013, changes to accumulated other comprehensive income (OCI) for Con Edison and CECONY are as follows:


*(Millions of Dollars)*	Con Edison			CECONY
Accumulated OCI, net of taxes, at December 31, 2012		$(53	)		$ (9	)
OCI before reclassifications		1			—
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $1 and $- for Con Edison and CECONY, respectively (a)(b)		2			—
Total OCI, net of taxes, at March 31, 2013		$ 3			$ —
Accumulated OCI, net of taxes, at March 31, 2013 (b)		$(50	)		$ (9	)
OCI before reclassifications		—			—
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $1 and $- for Con Edison and CECONY, respectively (a)(b)		2			—
Total OCI, net of taxes, at June 30, 2013		$ 2			$ —
Accumulated OCI, net of taxes, at June 30, 2013 (b)		$(48	)		$ (9	)

(a)

For the portion of unrecognized pension and other postretirement benefit costs relating to the regulated Utilities, costs are recorded into, and amortized out of, regulatory assets instead of OCI. The net actuarial losses and prior service costs recognized during the period are included in the computation of net periodic pension and other postretirement benefit cost. See Notes E and F.

(b)	Tax reclassified from accumulated OCI is reported in the income tax expense line item of the income statement.

CECONY [Member]

Summary of Significant Accounting Policies

Note A — Summary of Significant Accounting Policies

Earnings Per Common Share

For the three and six months ended June 30, 2013 and 2012, basic and diluted earnings per share (EPS) for Con Edison are calculated as follows:


	For the Three Months Ended June 30,				For the Six Months Ended June 30,
*(Millions of Dollars, except per share amounts/Shares in Millions)*	2013		2012		2013		2012
Net income for common stock		$ 172		$ 214		$ 364		$ 491
Weighted average common shares outstanding – basic		292.9		292.9		292.9		292.9
Add: Incremental shares attributable to effect of potentially dilutive securities		1.4		1.5		1.4		1.5
Adjusted weighted average common shares outstanding – diluted		294.3		294.4		294.3		294.4
Net Income for common stock per common share – basic		$ 0.59		$ 0.73		$ 1.24		$ 1.68
Net Income for common stock per common share – diluted		$ 0.59		$ 0.73		$ 1.24		$ 1.67

Changes in Accumulated Other Comprehensive Income by Component

For the three and six months ended June 30, 2013, changes to accumulated other comprehensive income (OCI) for Con Edison and CECONY are as follows:


*(Millions of Dollars)*	Con Edison			CECONY
Accumulated OCI, net of taxes, at December 31, 2012		$(53	)		$ (9	)
OCI before reclassifications		1			—
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $1 and $- for Con Edison and CECONY, respectively (a)(b)		2			—
Total OCI, net of taxes, at March 31, 2013		$ 3			$ —
Accumulated OCI, net of taxes, at March 31, 2013 (b)		$(50	)		$ (9	)
OCI before reclassifications		—			—
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $1 and $- for Con Edison and CECONY, respectively (a)(b)		2			—
Total OCI, net of taxes, at June 30, 2013		$ 2			$ —
Accumulated OCI, net of taxes, at June 30, 2013 (b)		$(48	)		$ (9	)

(a)

(b)	Tax reclassified from accumulated OCI is reported in the income tax expense line item of the income statement.

Regulatory Matters

6 Months Ended

Jun. 30, 2013

Regulatory Matters

Note B — Regulatory Matters

Rate Agreements

CECONY – Electric, Gas and Steam

In January 2013, CECONY filed requests for electric, gas and steam rate changes, effective January 1, 2014. The company requested electric and gas rate increases of $375 million and $25 million, respectively, and a steam rate decrease of $5 million, reflecting, among other things, a return on common equity of 10.35 percent and a common equity ratio of approximately 50 percent. In May 2013, the New York State Public Service Commission (NYSPSC) staff submitted testimony which, as revised in July 2013, supports decreases in the company’s electric, gas and steam rates of $187 million, $122 million and $28 million, respectively, reflecting, among other things, a return on common equity of 8.7 percent and a common equity ratio of 48 percent. In June 2013, to update its rate change requests, the company submitted testimony supporting increases in its electric, gas and steam rates of $425 million, $26 million and $11 million, respectively, reflecting, among other things, a return on common equity of 10.1 percent and a common equity ratio of approximately 50 percent.

Other Regulatory Matters

In February 2009, the NYSPSC commenced a proceeding to examine the prudence of certain CECONY expenditures following the arrests of employees for accepting illegal payments from a construction contractor. Subsequently, additional employees were arrested for accepting illegal payments from materials suppliers and an engineering firm. The arrested employees were terminated by the company and have pled guilty or been convicted. Pursuant to NYSPSC orders, a portion of the company’s revenues (currently, $249 million, $32 million and $6 million on an annual basis for electric, gas and steam service, respectively) is being collected subject to potential refund to customers. The amount of electric revenues collected subject to refund, which was established in a different proceeding, and the amount of gas and steam revenues collected subject to refund were not established as indicative of the company’s potential liability in this proceeding. At June 30, 2013, the company had collected an estimated $1,246 million from customers subject to potential refund in connection with this proceeding. In January 2013, a NYSPSC consultant reported its estimate, with which the company does not agree, of $208 million of overcharges with respect to a substantial portion of the company’s construction expenditures from January 2000 to January 2009. The company is disputing the consultant’s estimate, including its determinations as to overcharges regarding specific construction expenditures it selected to review and its methodology of extrapolating such determinations over a substantial portion of the construction expenditures during this period. The NYSPSC’s consultant has not reviewed the company’s other expenditures. The company and NYSPSC staff are exploring a settlement in this proceeding. There is no assurance that there will be a settlement, and any settlement would be subject to NYSPSC approval. At June 30, 2013, the company had a $16 million regulatory liability for refund to customers of amounts recovered from vendors, arrested employees and insurers relating to this matter. The company is unable to estimate the amount, if any, by which any refund required by the NYSPSC may exceed this regulatory liability. The company currently estimates that any refund required by the NYSPSC could range in amount from the $16 million regulatory liability up to an amount based on the NYSPSC consultant’s $208 million estimate of overcharges.

In late October 2012, Superstorm Sandy caused extensive damage to the Utilities’ electric distribution system and interrupted service to approximately 1.4 million customers. Superstorm Sandy also damaged CECONY’s steam system and interrupted service to many of its steam customers. As of June 30, 2013, CECONY and O&R incurred response and restoration costs for Superstorm Sandy of $457 million and $93 million, respectively (including capital expenditures of $141 million and $15 million, respectively). Most of the costs that were not capitalized were deferred for recovery as a regulatory asset under the Utilities’ electric rate plans. See “Regulatory Assets and Liabilities” below. The Utilities’ New York electric rate plans include provisions for revenue decoupling, as a result of which delivery revenues generally are not affected by changes in delivery volumes from levels assumed when rates were approved. The provisions of the Utilities’ New York electric plans that impose penalties for operating performance provide for exceptions for major storms and catastrophic events beyond the control of the companies, including natural disasters such as hurricanes and floods. The NYSPSC and the New York State Attorney General are investigating the preparation and performance of the Utilities in connection with Superstorm Sandy and other major storms.

In June 2013, a commission appointed by the Governor of New York issued its final report on utility storm preparation and response. The commission identified deficiencies in the performance of the Utilities and other New York utilities and made recommendations regarding, among other things, preparation and response to flooding; estimation of customer restoration times; reliability of website outage maps; coordination with local governments and providers of other utility services; availability and allocation of staffing and other resources (including the utility industry’s mutual aid process); and communications with affected communities and local officials. The commission’s report also addressed the Long Island Power Authority, energy efficiency programs, utility infrastructure investment and regulatory deficiencies.

In March 2013, the New Jersey Board of Public Utilities established a proceeding to review the prudency of costs incurred by New Jersey utilities, including Rockland Electric Company (RECO, an O&R subsidiary), in response to major storm events in 2011 and 2012. At June 30, 2013, RECO had $29 million of storm costs deferred for recovery as a regulatory asset and had incurred $6 million of capital expenditures related to the storms.

Regulatory Assets and Liabilities

Regulatory assets and liabilities at June 30, 2013 and December 31, 2012 were comprised of the following items:


	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Regulatory assets
Unrecognized pension and other postretirement costs		$5,227		$5,677		$4,985		$5,407
Future income tax		1,996		1,922		1,889		1,831
Environmental remediation costs		713		730		599		615
Deferred storm costs		454		432		336		309
Pension and other postretirement benefits deferrals		201		183		170		154
Revenue taxes		183		176		176		170
Net electric deferrals		92		102		92		102
Unamortized loss on reacquired debt		69		74		66		70
Surcharge for New York State assessment		55		73		53		68
Deferred derivative losses – long-term		41		40		20		20
O&R transition bond charges		36		39		—		—
Preferred stock redemption		29		29		29		29
Workers’ compensation		18		19		18		19
Property tax reconciliation		18		16		—		—
Other		172		193		162		178
Regulatory assets – long-term		9,304		9,705		8,595		8,972
Deferred derivative losses – current		55		69		51		60
Recoverable energy costs – current		1		5		—		—
Regulatory assets – current		56		74		51		60
Total Regulatory Assets		$9,360		$9,779		$8,646		$9,032
Regulatory liabilities
Allowance for cost of removal less salvage		$ 518		$ 503		$ 433		$ 420
Property tax reconciliation		273		187		273		187
Net unbilled revenue deferrals		137		136		137		136
Long-term interest rate reconciliation		83		62		83		62
World Trade Center settlement proceeds		62		62		62		62
Carrying charges on T&D net plant – electric and steam		26		31		14		13
Expenditure prudence proceeding		16		14		16		14
Other		278		207		251		183
Regulatory liabilities – long-term		1,393		1,202		1,269		1,077
Refundable energy costs – current		63		82		32		48
Revenue decoupling mechanism		23		72		21		68
Deferred derivative gains – current		2		—		1		—
Electric surcharge offset		—		29		—		29
Regulatory liabilities – current		88		183		54		145
Total Regulatory Liabilities		$1,481		$1,385		$1,323		$1,222

“Deferred storm costs” represent response and restoration costs, other than capital expenditures, in connection with Superstorm Sandy and other major storms that were deferred by the Utilities. See “Other Regulatory Matters,” above.

CECONY [Member]

Regulatory Matters

Note B — Regulatory Matters

Rate Agreements

CECONY – Electric, Gas and Steam

Other Regulatory Matters

Regulatory Assets and Liabilities

Regulatory assets and liabilities at June 30, 2013 and December 31, 2012 were comprised of the following items:


	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Regulatory assets
Unrecognized pension and other postretirement costs		$5,227		$5,677		$4,985		$5,407
Future income tax		1,996		1,922		1,889		1,831
Environmental remediation costs		713		730		599		615
Deferred storm costs		454		432		336		309
Pension and other postretirement benefits deferrals		201		183		170		154
Revenue taxes		183		176		176		170
Net electric deferrals		92		102		92		102
Unamortized loss on reacquired debt		69		74		66		70
Surcharge for New York State assessment		55		73		53		68
Deferred derivative losses – long-term		41		40		20		20
O&R transition bond charges		36		39		—		—
Preferred stock redemption		29		29		29		29
Workers’ compensation		18		19		18		19
Property tax reconciliation		18		16		—		—
Other		172		193		162		178
Regulatory assets – long-term		9,304		9,705		8,595		8,972
Deferred derivative losses – current		55		69		51		60
Recoverable energy costs – current		1		5		—		—
Regulatory assets – current		56		74		51		60
Total Regulatory Assets		$9,360		$9,779		$8,646		$9,032
Regulatory liabilities
Allowance for cost of removal less salvage		$ 518		$ 503		$ 433		$ 420
Property tax reconciliation		273		187		273		187
Net unbilled revenue deferrals		137		136		137		136
Long-term interest rate reconciliation		83		62		83		62
World Trade Center settlement proceeds		62		62		62		62
Carrying charges on T&D net plant – electric and steam		26		31		14		13
Expenditure prudence proceeding		16		14		16		14
Other		278		207		251		183
Regulatory liabilities – long-term		1,393		1,202		1,269		1,077
Refundable energy costs – current		63		82		32		48
Revenue decoupling mechanism		23		72		21		68
Deferred derivative gains – current		2		—		1		—
Electric surcharge offset		—		29		—		29
Regulatory liabilities – current		88		183		54		145
Total Regulatory Liabilities		$1,481		$1,385		$1,323		$1,222

Capitalization

6 Months Ended

Jun. 30, 2013

Capitalization

Note C — Capitalization

In February 2013, CECONY issued $700 million aggregate principal amount of 3.95 percent 30-year debentures and redeemed at maturity $500 million of 4.875 percent 10-year debentures. In June 2013, CECONY redeemed at maturity $200 million of 3.85 percent 10-year debentures. In April 2013, a Con Edison Development subsidiary issued $219 million aggregate principal amount of 4.78 percent senior notes secured by the company’s California solar projects. The notes have a weighted average life of 15 years and final maturity of 2037.

The carrying amounts and fair values of long-term debt are:


*(Millions of Dollars)*	June 30, 2013				December 31, 2012
Long-Term Debt (including current portion)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Con Edison		$10,977		$12,313		$10,768		$12,935
CECONY		$ 9,840		$10,991		$ 9,845		$11,751

Fair values of long-term debt have been estimated primarily using available market information. For Con Edison, $11,677 million and $636 million of the fair value of long-term debt at June 30, 2013 are classified as Level 2 and Level 3, respectively. For CECONY, $10,355 million and $636 million of the fair value of long-term debt at June 30, 2013 are classified as Level 2 and Level 3, respectively (see Note L). The $636 million of long-term debt classified as Level 3 is CECONY’s tax-exempt, auction-rate securities for which the market is highly illiquid and there is a lack of observable inputs.

CECONY [Member]

Capitalization

Note C — Capitalization

The carrying amounts and fair values of long-term debt are:


*(Millions of Dollars)*	June 30, 2013				December 31, 2012
Long-Term Debt (including current portion)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Con Edison		$10,977		$12,313		$10,768		$12,935
CECONY		$ 9,840		$10,991		$ 9,845		$11,751

Short-Term Borrowing	6 Months Ended
Short-Term Borrowing	Jun. 30, 2013
Short-Term Borrowing	Note D — Short-Term Borrowing At June 30, 2013, Con Edison had $1,400 million of commercial paper outstanding of which $1,230 million was outstanding under CECONY’s program. The weighted average interest rate was 0.3 percent for both Con Edison and CECONY. At December 31, 2012, Con Edison had $539 million of commercial paper outstanding of which $421 million was outstanding under CECONY’s program. The weighted average interest rate was 0.3 percent for both Con Edison and CECONY. At June 30, 2013 and December 31, 2012, no loans were outstanding under the Companies’ credit agreement and $34 million (including $11 million for CECONY) and $131 million (including $121 million for CECONY) of letters of credit were outstanding, respectively, under the credit agreement.
CECONY [Member]
Short-Term Borrowing	Note D — Short-Term Borrowing At June 30, 2013, Con Edison had $1,400 million of commercial paper outstanding of which $1,230 million was outstanding under CECONY’s program. The weighted average interest rate was 0.3 percent for both Con Edison and CECONY. At December 31, 2012, Con Edison had $539 million of commercial paper outstanding of which $421 million was outstanding under CECONY’s program. The weighted average interest rate was 0.3 percent for both Con Edison and CECONY. At June 30, 2013 and December 31, 2012, no loans were outstanding under the Companies’ credit agreement and $34 million (including $11 million for CECONY) and $131 million (including $121 million for CECONY) of letters of credit were outstanding, respectively, under the credit agreement.

Pension Benefits

6 Months Ended

Jun. 30, 2013

Pension Benefits

Note E — Pension Benefits

Net Periodic Benefit Cost

The components of the Companies’ net periodic benefit costs for the three and six months ended June 30, 2013 and 2012 were as follows:


	For the Three Months Ended June 30,
	Con Edison						CECONY
*(Millions of Dollars)*	2013			2012			2013			2012
Service cost – including administrative expenses		$ 67			$ 59			$ 62			$ 55
Interest cost on projected benefit obligation		134			137			126			128
Expected return on plan assets		(187	)		(177	)		(178	)		(168	)
Recognition of net actuarial loss		208			177			197			168
Recognition of prior service costs		1			2			1			2
NET PERIODIC BENEFIT COST		$ 223			$ 198			$ 208			$ 185
Amortization of regulatory asset		1			1			1			1
TOTAL PERIODIC BENEFIT COST		$ 224			$ 199			$ 209			$ 186
Cost capitalized		(88	)		(68	)		(84	)		(63	)
Reconciliation to rate level		(30	)		3			(29	)		2
Cost charged to operating expenses		$ 106			$ 134			$ 96			$ 125


	For the Six Months Ended June 30,
	Con Edison						CECONY
*(Millions of Dollars)*	2013			2012			2013			2012
Service cost – including administrative expenses		$ 133			$ 118			$ 124			$ 110
Interest cost on projected benefit obligation		268			274			252			257
Expected return on plan assets		(375	)		(352	)		(356	)		(335	)
Recognition of net actuarial loss		416			354			394			335
Recognition of prior service costs		3			4			2			3
NET PERIODIC BENEFIT COST		$ 445			$ 398			$ 416			$ 370
Amortization of regulatory asset		1			1			1			1
TOTAL PERIODIC BENEFIT COST		$ 446			$ 399			$ 417			$ 371
Cost capitalized		(170	)		(135	)		(163	)		(126	)
Reconciliation to rate level		(24	)		(32	)		(23	)		(36	)
Cost charged to operating expenses		$ 252			$ 232			$ 231			$ 209

Expected Contributions

Based on estimates as of June 30, 2013, the Companies expect to make contributions to the pension plan during 2013 of $867 million (of which $810 million is to be contributed by CECONY). The Companies’ policy is to fund their accounting cost to the extent tax deductible. During the first six months of 2013, CECONY contributed $350 million to the pension plan and funded $11 million for the non-qualified supplemental plans.

CECONY [Member]

Pension Benefits

Note E — Pension Benefits

Net Periodic Benefit Cost

The components of the Companies’ net periodic benefit costs for the three and six months ended June 30, 2013 and 2012 were as follows:


	For the Three Months Ended June 30,
	Con Edison						CECONY
*(Millions of Dollars)*	2013			2012			2013			2012
Service cost – including administrative expenses		$ 67			$ 59			$ 62			$ 55
Interest cost on projected benefit obligation		134			137			126			128
Expected return on plan assets		(187	)		(177	)		(178	)		(168	)
Recognition of net actuarial loss		208			177			197			168
Recognition of prior service costs		1			2			1			2
NET PERIODIC BENEFIT COST		$ 223			$ 198			$ 208			$ 185
Amortization of regulatory asset		1			1			1			1
TOTAL PERIODIC BENEFIT COST		$ 224			$ 199			$ 209			$ 186
Cost capitalized		(88	)		(68	)		(84	)		(63	)
Reconciliation to rate level		(30	)		3			(29	)		2
Cost charged to operating expenses		$ 106			$ 134			$ 96			$ 125


	For the Six Months Ended June 30,
	Con Edison						CECONY
*(Millions of Dollars)*	2013			2012			2013			2012
Service cost – including administrative expenses		$ 133			$ 118			$ 124			$ 110
Interest cost on projected benefit obligation		268			274			252			257
Expected return on plan assets		(375	)		(352	)		(356	)		(335	)
Recognition of net actuarial loss		416			354			394			335
Recognition of prior service costs		3			4			2			3
NET PERIODIC BENEFIT COST		$ 445			$ 398			$ 416			$ 370
Amortization of regulatory asset		1			1			1			1
TOTAL PERIODIC BENEFIT COST		$ 446			$ 399			$ 417			$ 371
Cost capitalized		(170	)		(135	)		(163	)		(126	)
Reconciliation to rate level		(24	)		(32	)		(23	)		(36	)
Cost charged to operating expenses		$ 252			$ 232			$ 231			$ 209

Expected Contributions

Other Postretirement Benefits

6 Months Ended

Jun. 30, 2013

Other Postretirement Benefits

Note F — Other Postretirement Benefits

Net Periodic Benefit Cost

The components of the Companies’ net periodic postretirement benefit costs for the three and six months ended June 30, 2013 and 2012 were as follows:


	For the Three Months Ended June 30,
	Con Edison						CECONY
*(Millions of Dollars)*	2013			2012			2013			2012
Service cost		$ 6			$ 6			$ 5			$ 5
Interest cost on accumulated other postretirement benefit obligation		13			18			12			15
Expected return on plan assets		(19	)		(21	)		(17	)		(18	)
Recognition of net actuarial loss		16			24			14			21
Recognition of prior service cost		(7	)		(5	)		(6	)		(4	)
Recognition of transition obligation		—			1			—			1
NET PERIODIC POSTRETIREMENT BENEFIT COST		$ 9			$ 23			$ 8			$ 20
Cost capitalized		(4	)		(8	)		(4	)		(7	)
Reconciliation to rate level		16			5			13			4
Cost charged to operating expenses		$ 21			$ 20			$ 17			$ 17


	For the Six Months Ended June 30,
	Con Edison						CECONY
*(Millions of Dollars)*	2013			2012			2013			2012
Service cost		$ 12			$ 13			$ 9			$ 10
Interest cost on accumulated other postretirement benefit obligation		27			36			23			32
Expected return on plan assets		(39	)		(42	)		(34	)		(38	)
Recognition of net actuarial loss		32			49			28			44
Recognition of prior service cost		(13	)		(11	)		(11	)		(9	)
Recognition of transition obligation		—			1			—			1
NET PERIODIC POSTRETIREMENT BENEFIT COST		$ 19			$ 46			$ 15			$ 40
Cost capitalized		(7	)		(16	)		(6	)		(14	)
Reconciliation to rate level		29			14			25			8
Cost charged to operating expenses		$ 41			$ 44			$ 34			$ 34

Expected Contributions

Based on estimates as of June 30, 2013, Con Edison expects to make a contribution of $10 million, nearly all of which is for CECONY, to the other postretirement benefit plans in 2013.

Environmental Matters

6 Months Ended

Jun. 30, 2013

Environmental Matters

Note G — Environmental Matters

Superfund Sites

Hazardous substances, such as asbestos, polychlorinated biphenyls (PCBs) and coal tar, have been used or generated in the course of operations of the Utilities and their predecessors and are present at sites and in facilities and equipment they currently or previously owned, including sites at which gas was manufactured or stored.

The Federal Comprehensive Environmental Response, Compensation and Liability Act of 1980 and similar state statutes (Superfund) impose joint and several liability, regardless of fault, upon generators of hazardous substances for investigation and remediation costs (which include costs of demolition, removal, disposal, storage, replacement, containment, and monitoring) and natural resource damages. Liability under these laws can be material and may be imposed for contamination from past acts, even though such past acts may have been lawful at the time they occurred. The sites at which the Utilities have been asserted to have liability under these laws, including their manufactured gas plant sites and any neighboring areas to which contamination may have migrated, are referred to herein as “Superfund Sites.”

For Superfund Sites where there are other potentially responsible parties and the Utilities are not managing the site investigation and remediation, the accrued liability represents an estimate of the amount the Utilities will need to pay to investigate and, where determinable, discharge their related obligations. For Superfund Sites (including the manufactured gas plant sites) for which one of the Utilities is managing the investigation and remediation, the accrued liability represents an estimate of the company’s share of undiscounted cost to investigate the sites and, for sites that have been investigated in whole or in part, the cost to remediate the sites, if remediation is necessary and if a reasonable estimate of such cost can be made. Remediation costs are estimated in light of the information available, applicable remediation standards, and experience with similar sites.

The accrued liabilities and regulatory assets related to Superfund Sites at June 30, 2013 and December 31, 2012 were as follows:


	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Accrued Liabilities:
Manufactured gas plant sites		$447		$462		$339		$351
Other Superfund Sites		75		83		74		82
Total		$522		$545		$413		$433
Regulatory assets		$713		$730		$599		$615

Most of the accrued Superfund Site liability relates to sites that have been investigated, in whole or in part. However, for some of the sites, the extent and associated cost of the required remediation has not yet been determined. As investigations progress and information pertaining to the required remediation becomes available, the Utilities expect that additional liability may be accrued, the amount of which is not presently determinable but may be material. Under their current rate agreements, the Utilities are permitted to recover or defer as regulatory assets (for subsequent recovery through rates) certain site investigation and remediation costs.

Environmental remediation costs incurred and insurance recoveries received related to Superfund Sites for the three and six months ended June 30, 2013 and 2012 were as follows:


	For the Three Months Ended June 30,
	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Remediation costs incurred		$14		$8		$13		$7
Insurance recoveries received		—		—		—		—


	For the Six Months Ended June 30,
	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Remediation costs incurred		$24		$15		$20		$14
Insurance recoveries received		—		—		—		—

In 2010, CECONY estimated that for its manufactured gas plant sites, its aggregate undiscounted potential liability for the investigation and remediation of coal tar and/or other manufactured gas plant-related environmental contaminants could range up to $1.9 billion. In 2010, O&R estimated that for its manufactured gas plant sites, each of which has been investigated, the aggregate undiscounted potential liability for the remediation of such contaminants could range up to $200 million. These estimates were based on the assumption that there is contamination at all sites, including those that have not yet been fully investigated and additional assumptions about the extent of the contamination and the type and extent of the remediation that may be required. Actual experience may be materially different.

Asbestos Proceedings

Suits have been brought in New York State and federal courts against the Utilities and many other defendants, wherein a large number of plaintiffs sought large amounts of compensatory and punitive damages for deaths and injuries allegedly caused by exposure to asbestos at various premises of the Utilities. The suits that have been resolved, which are many, have been resolved without any payment by the Utilities, or for amounts that were not, in the aggregate, material to them. The amounts specified in all the remaining thousands of suits total billions of dollars; however, the Utilities believe that these amounts are greatly exaggerated, based on the disposition of previous claims. In 2010, CECONY estimated that its aggregate undiscounted potential liability for these suits and additional suits that may be brought over the next 15 years is $10 million. The estimate was based upon a combination of modeling, historical data analysis and risk factor assessment. Actual experience may be materially different. In addition, certain current and former employees have claimed or are claiming workers’ compensation benefits based on alleged disability from exposure to asbestos. Under its current rate agreements, CECONY is permitted to defer as regulatory assets (for subsequent recovery through rates) costs incurred for its asbestos lawsuits and workers’ compensation claims. The accrued liability for asbestos suits and workers’ compensation proceedings (including those related to asbestos exposure) and the amounts deferred as regulatory assets for the Companies at June 30, 2013 and December 31, 2012 were as follows:


	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Accrued liability – asbestos suits		$10		$10		$10		$10
Regulatory assets – asbestos suits		$10		$10		$10		$10
Accrued liability – workers’ compensation		$93		$94		$88		$89
Regulatory assets – workers’ compensation		$18		$19		$18		$19

CECONY [Member]

Environmental Matters

Note G — Environmental Matters

Superfund Sites

The accrued liabilities and regulatory assets related to Superfund Sites at June 30, 2013 and December 31, 2012 were as follows:


	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Accrued Liabilities:
Manufactured gas plant sites		$447		$462		$339		$351
Other Superfund Sites		75		83		74		82
Total		$522		$545		$413		$433
Regulatory assets		$713		$730		$599		$615

Environmental remediation costs incurred and insurance recoveries received related to Superfund Sites for the three and six months ended June 30, 2013 and 2012 were as follows:


	For the Three Months Ended June 30,
	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Remediation costs incurred		$14		$8		$13		$7
Insurance recoveries received		—		—		—		—


	For the Six Months Ended June 30,
	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Remediation costs incurred		$24		$15		$20		$14
Insurance recoveries received		—		—		—		—

Asbestos Proceedings


	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Accrued liability – asbestos suits		$10		$10		$10		$10
Regulatory assets – asbestos suits		$10		$10		$10		$10
Accrued liability – workers’ compensation		$93		$94		$88		$89
Regulatory assets – workers’ compensation		$18		$19		$18		$19

Other Material Contingencies

6 Months Ended

Jun. 30, 2013

Other Material Contingencies

Note H — Other Material Contingencies

Manhattan Steam Main Rupture

In July 2007, a CECONY steam main located in midtown Manhattan ruptured. It has been reported that one person died and others were injured as a result of the incident. Several buildings in the area were damaged. Debris from the incident included dirt and mud containing asbestos. The response to the incident required the closing of several buildings and streets for various periods. Approximately 93 suits are pending against the company seeking generally unspecified compensatory and, in some cases, punitive damages, for personal injury, property damage and business interruption. The company has not accrued a liability for the suits. The company has notified its insurers of the incident and believes that the policies in force at the time of the incident will cover most of the company’s costs, which the company is unable to estimate, but which could be substantial, to satisfy its liability to others in connection with the incident.

Lease In/Lease Out Transactions

In each of 1997 and 1999, Con Edison Development entered into transactions in which it leased property and then immediately subleased the properties back to the lessor (termed “Lease In/Lease Out,” or LILO transactions). The transactions respectively involved electric generating and gas distribution facilities in the Netherlands, with a total investment of $259 million. The transactions were financed with $93 million of equity and $166 million of non-recourse, long-term debt secured by the underlying assets. In accordance with the accounting rules for leases, Con Edison accounted for the two LILO transactions as leveraged leases. Accordingly, the company’s investment in these leases, net of non-recourse debt, was carried as a single amount in Con Edison’s consolidated balance sheet and income was recognized pursuant to a method that incorporated a level rate of return for those years when net investment in the lease was positive.

On audit of Con Edison’s tax return for 1997, the Internal Revenue Service (IRS) disallowed tax losses in connection with the 1997 LILO transaction and assessed the company a $0.3 million income tax deficiency. On audits of Con Edison’s 1998 through 2011 tax returns, the IRS disallowed $574 million of tax losses taken with respect to both LILO transactions. In December 2005, Con Edison paid the $0.3 million deficiency asserted by the IRS for the tax year 1997 with respect to the 1997 LILO transaction. In April 2006, the company paid interest of $0.2 million associated with the deficiency and commenced an action in the United States Court of Federal Claims, entitled Consolidated Edison Company of New York, Inc. v. United States, to obtain a refund of tax and interest. A trial was completed in November 2007. In October 2009, the court issued a decision in favor of the company concluding that the 1997 LILO transaction was, in substance, a true lease that possessed economic substance, the loans relating to the lease constituted bona fide indebtedness, and the deductions for the 1997 LILO transactions claimed by the company in its 1997 federal income tax return are allowable. In January 2013, the United States Court of Appeals for the Federal Circuit reversed the October 2009 trial court decision and disallowed the tax losses claimed by the company relating to the 1997 LILO transaction. In March 2013, the Court of Appeals denied the company’s request to grant rehearing en banc of the January 2013 decision. In June 2013, Con Edison entered into a closing agreement with the IRS regarding the 1997 and 1999 LILO transactions.

As a result of the January 2013 Court of Appeals decision, in the three months ended March 31, 2013, Con Edison recorded an after-tax charge of $150 million to reflect, as required by the accounting rules for leveraged lease transactions, the recalculation of the accounting effect of the LILO transactions based on the revised after-tax cash flows projected from the inception of the leveraged leases as well as the interest on the potential tax liability resulting from the disallowance of federal and state income tax losses with respect to the LILO transactions (see “Uncertain Tax Positions” in Note I). In June 2013, the 1999 LILO transaction was terminated, as a result of which the company realized a $29 million gain (after-tax) and received net cash proceeds of $108 million. The effect on Con Edison’s consolidated income statement is as follows:


*(Millions of Dollars)*	For the Three Months Ended June 30, 2013			For the Six Months Ended June 30, 2013
Increase/(decrease) to non-utility operating revenues		$51			$ (70	)
(Increase)/decrease to other interest expense		—			(131	)
Income tax benefit/(expense)		(22	)		80
Total increase/(decrease) in net income		$29			$(121	)

The transactions did not impact earnings in 2012.

At June 30, 2013, the company’s net investment in the 1997 LILO transaction was $43 million, comprised of a $47 million gross investment less $4 million of deferred tax liabilities. At December 31, 2012, the company’s net investment in the LILO transactions was $(76) million, comprised of a $228 million gross investment less $304 million of deferred tax liabilities.

In January 2013, to defray interest charges, the company deposited $447 million with federal and state tax agencies relating primarily to the potential tax liability from these LILO transactions in past tax years and interest thereon. In June 2013, at the company’s request the IRS returned $95 million of the deposit. The company estimates that if it were to negotiate the termination of the 1997 LILO transaction, it could receive cash proceeds of approximately $90 million (pre-tax), which amount could be higher or lower depending on the negotiations.

Other Contingencies

See “Other Regulatory Matters” in Note B and “Uncertain Tax Positions” in Note I.

Guarantees

Con Edison and its subsidiaries enter into various agreements providing financial or performance assurance primarily to third parties on behalf of their subsidiaries. Maximum amounts guaranteed by Con Edison totaled $883 million and $859 million at June 30, 2013 and December 31, 2012, respectively.

A summary, by type and term, of Con Edison’s total guarantees at June 30, 2013 is as follows:


Guarantee Type	0 – 3 years		4 – 10 years		> 10 years		Total
	*(Millions of Dollars)*
Energy transactions		$777		$31		$28		$836
Intra-company guarantees		16		—		—		16
Other guarantees		31		—		—		31
Total		$824		$31		$28		$883

Energy Transactions — Con Edison guarantees payments on behalf of its competitive energy businesses in order to facilitate physical and financial transactions in gas, pipeline capacity, transportation, oil, electricity, renewable energy credits and energy services. To the extent that liabilities exist under the contracts subject to these guarantees, such liabilities are included in Con Edison’s consolidated balance sheet.

Intra-company Guarantees — Con Edison guarantees electricity sales made by Con Edison Energy and Con Edison Solutions to O&R and CECONY.

Other Guarantees — Con Edison and Con Edison Development also guarantee the following:

•

$2 million relates to guarantees issued by Con Edison to CECONY covering a former Con Edison subsidiary’s lease payment to use CECONY’s conduit system in accordance with a tariff approved by the NYSPSC and a guarantee issued by Con Edison to a landlord to guarantee the former subsidiary’s obligations under a building lease. The former subsidiary is obligated to reimburse Con Edison for any payments made under these guarantees. This obligation is fully secured by letters of credit;

•

$25 million for guarantees provided by Con Edison to Travelers Insurance Company for indemnity agreements for surety bonds in connection with energy service projects performed by Con Edison Solutions;

•

$4 million for guarantees provided by Con Edison Development to Travelers Insurance Company for indemnity agreements for surety bonds in connection with the construction and operation of solar facilities performed by its subsidiaries; and

•

Con Edison, on behalf of Con Edison Solutions, as a retail electric provider, issued a guarantee to the Public Utility Commission of Texas with no specified limitation on the amount guaranteed, covering the payment of all obligations of a retail electric provider. Con Edison’s estimate of the maximum potential obligation is $5 million as of June 30, 2013.

CECONY [Member]

Other Material Contingencies

Note H — Other Material Contingencies

Manhattan Steam Main Rupture

Lease In/Lease Out Transactions


*(Millions of Dollars)*	For the Three Months Ended June 30, 2013			For the Six Months Ended June 30, 2013
Increase/(decrease) to non-utility operating revenues		$51			$ (70	)
(Increase)/decrease to other interest expense		—			(131	)
Income tax benefit/(expense)		(22	)		80
Total increase/(decrease) in net income		$29			$(121	)

The transactions did not impact earnings in 2012.

Other Contingencies

See “Other Regulatory Matters” in Note B and “Uncertain Tax Positions” in Note I.

Guarantees

A summary, by type and term, of Con Edison’s total guarantees at June 30, 2013 is as follows:


Guarantee Type	0 – 3 years		4 – 10 years		> 10 years		Total
	*(Millions of Dollars)*
Energy transactions		$777		$31		$28		$836
Intra-company guarantees		16		—		—		16
Other guarantees		31		—		—		31
Total		$824		$31		$28		$883

Intra-company Guarantees — Con Edison guarantees electricity sales made by Con Edison Energy and Con Edison Solutions to O&R and CECONY.

Other Guarantees — Con Edison and Con Edison Development also guarantee the following:

•

Income Tax	6 Months Ended
Income Tax	Jun. 30, 2013
Income Tax	Note I — Income Tax Con Edison’s income tax expense decreased to $65 million for the three months ended June 30, 2013, from $106 million for the three months ended June 30, 2012. The effective tax rate for the three months ended June 30, 2013 and 2012 was 27 percent and 33 percent, respectively. The reduction in the effective tax rate is due primarily to the impact of comparable favorable reconciling items on reduced income before income tax expense in the 2013 period compared with the 2012 period. Comparable favorable rate reconciling items have a greater impact on the effective tax rate as income before income tax expense decreases. The reduction in the effective tax rate also reflects favorable rate reconciling items in the 2013 period related to plant and deductions for injuries and damages. Con Edison’s income tax expense decreased to $122 million for the six months ended June 30, 2013, from $240 million for the six months ended June 30, 2012. The effective tax rate for the six months ended June 30, 2013 and 2012 was 25 percent and 33 percent, respectively. The reduction in the effective rate is due primarily to the impact of comparable favorable reconciling items on reduced income before income tax expense in the 2013 period compared with the 2012 period. Additionally, in the first quarter of 2013, the IRS accepted on audit the Company’s claim for manufacturing tax deductions. This deduction, plus higher state income taxes in 2012, also resulted in a reduction in the 2013 effective tax rate. CECONY’s income tax expense decreased to $57 million for the three months ended June 30, 2013, from $75 million for the three months ended June 30, 2012. CECONY’s income tax expense was $209 million in each of the six months ended June 30, 2013 and 2012. CECONY’s effective tax rate was 27 percent and 33 percent for the three and six months ended June 30, 2013, respectively, compared to 32 percent for each of the three and six months ended June 30, 2012. The decrease in the effective tax rate for the three months ended June 30, 2013, was due primarily to an increase in plant related rate reconciling items and an increase in deductions for injuries and damages. Uncertain Tax Positions During the first quarter of 2013, the IRS accepted Con Edison’s deductions for repair costs to utility plant (the “repair allowance deductions”). As a result of this settlement, Con Edison and CECONY reduced their estimated liabilities for prior year uncertain tax positions by $72 million and $66 million, respectively, with a corresponding increase to accumulated deferred income tax liabilities. In addition, as a result of the January 2013 Court of Appeals decision (see “Lease In/Lease Out Transactions” in Note H), Con Edison increased its estimated prior year liabilities for federal and state uncertain tax positions by $238 million in the first quarter of 2013, with a corresponding reduction to accumulated deferred income tax liabilities. In June 2013, Con Edison entered into a closing agreement with the IRS regarding the 1997 and 1999 LILO transactions, as a result of which the company decreased its estimated prior year liabilities for federal and state uncertain tax positions by $238 million in the second quarter of 2013, with a corresponding increase to its current income tax liability. These changes to the Companies’ estimated liabilities for uncertain tax positions had no impact on income tax expense for the six months ended June 30, 2013. There were no material changes to the Companies’ estimated liabilities for uncertain tax positions during the six months ended June 30, 2012. At June 30, 2013, the estimated liabilities for uncertain tax positions for Con Edison and CECONY were $16 million and $7 million, respectively. The Companies recognize interest on liabilities for uncertain tax positions in interest expense and would recognize penalties, if any, in operating expenses in the Companies’ consolidated income statements. In the first quarter of 2013, Con Edison recognized $126 million of interest expense ($131 million related to the LILO transactions, less a reduction of $5 million in accrued interest expense primarily associated with repair allowance deductions). In the second quarter of 2013, Con Edison recognized an immaterial amount of interest expense. The Companies’ accrued interest on uncertain tax positions at June 30, 2013 and December 31, 2012 was immaterial. The Companies reasonably expect to resolve $13 million ($7 million for CECONY) of their uncertain tax positions with the IRS within the next twelve months, and accordingly have reflected their estimated liability for uncertain tax positions as current liabilities on their respective consolidated balance sheets. At June 30, 2013, the total amount of unrecognized tax benefits that, if recognized, would affect the Companies’ effective tax rate is $6 million for Con Edison and no impact to CECONY.
CECONY [Member]
Income Tax	Note I — Income Tax Con Edison’s income tax expense decreased to $65 million for the three months ended June 30, 2013, from $106 million for the three months ended June 30, 2012. The effective tax rate for the three months ended June 30, 2013 and 2012 was 27 percent and 33 percent, respectively. The reduction in the effective tax rate is due primarily to the impact of comparable favorable reconciling items on reduced income before income tax expense in the 2013 period compared with the 2012 period. Comparable favorable rate reconciling items have a greater impact on the effective tax rate as income before income tax expense decreases. The reduction in the effective tax rate also reflects favorable rate reconciling items in the 2013 period related to plant and deductions for injuries and damages. Con Edison’s income tax expense decreased to $122 million for the six months ended June 30, 2013, from $240 million for the six months ended June 30, 2012. The effective tax rate for the six months ended June 30, 2013 and 2012 was 25 percent and 33 percent, respectively. The reduction in the effective rate is due primarily to the impact of comparable favorable reconciling items on reduced income before income tax expense in the 2013 period compared with the 2012 period. Additionally, in the first quarter of 2013, the IRS accepted on audit the Company’s claim for manufacturing tax deductions. This deduction, plus higher state income taxes in 2012, also resulted in a reduction in the 2013 effective tax rate. CECONY’s income tax expense decreased to $57 million for the three months ended June 30, 2013, from $75 million for the three months ended June 30, 2012. CECONY’s income tax expense was $209 million in each of the six months ended June 30, 2013 and 2012. CECONY’s effective tax rate was 27 percent and 33 percent for the three and six months ended June 30, 2013, respectively, compared to 32 percent for each of the three and six months ended June 30, 2012. The decrease in the effective tax rate for the three months ended June 30, 2013, was due primarily to an increase in plant related rate reconciling items and an increase in deductions for injuries and damages. Uncertain Tax Positions During the first quarter of 2013, the IRS accepted Con Edison’s deductions for repair costs to utility plant (the “repair allowance deductions”). As a result of this settlement, Con Edison and CECONY reduced their estimated liabilities for prior year uncertain tax positions by $72 million and $66 million, respectively, with a corresponding increase to accumulated deferred income tax liabilities. In addition, as a result of the January 2013 Court of Appeals decision (see “Lease In/Lease Out Transactions” in Note H), Con Edison increased its estimated prior year liabilities for federal and state uncertain tax positions by $238 million in the first quarter of 2013, with a corresponding reduction to accumulated deferred income tax liabilities. In June 2013, Con Edison entered into a closing agreement with the IRS regarding the 1997 and 1999 LILO transactions, as a result of which the company decreased its estimated prior year liabilities for federal and state uncertain tax positions by $238 million in the second quarter of 2013, with a corresponding increase to its current income tax liability. These changes to the Companies’ estimated liabilities for uncertain tax positions had no impact on income tax expense for the six months ended June 30, 2013. There were no material changes to the Companies’ estimated liabilities for uncertain tax positions during the six months ended June 30, 2012. At June 30, 2013, the estimated liabilities for uncertain tax positions for Con Edison and CECONY were $16 million and $7 million, respectively. The Companies recognize interest on liabilities for uncertain tax positions in interest expense and would recognize penalties, if any, in operating expenses in the Companies’ consolidated income statements. In the first quarter of 2013, Con Edison recognized $126 million of interest expense ($131 million related to the LILO transactions, less a reduction of $5 million in accrued interest expense primarily associated with repair allowance deductions). In the second quarter of 2013, Con Edison recognized an immaterial amount of interest expense. The Companies’ accrued interest on uncertain tax positions at June 30, 2013 and December 31, 2012 was immaterial. The Companies reasonably expect to resolve $13 million ($7 million for CECONY) of their uncertain tax positions with the IRS within the next twelve months, and accordingly have reflected their estimated liability for uncertain tax positions as current liabilities on their respective consolidated balance sheets. At June 30, 2013, the total amount of unrecognized tax benefits that, if recognized, would affect the Companies’ effective tax rate is $6 million for Con Edison and no impact to CECONY.

Financial Information by Business Segment

6 Months Ended

Jun. 30, 2013

Financial Information by Business Segment

Note J — Financial Information by Business Segment

The financial data for the business segments are as follows:


	For the Three Months Ended June 30,
	Operating revenues						Inter-segment revenues						Depreciation and amortization				Operating income
*(Millions of Dollars)*	2013			2012			2013			2012			2013		2012		2013			2012
CECONY
Electric	$	1,872		$	1,961		$	4		$	4		$	186	$	175	$	307		$	348
Gas		331			265			2			2			32		30		53			54
Steam		118			83			19			19			17		16		(14	)		(22	)
Consolidation adjustments		—			—			(25	)		(25	)		—		—		—			—
Total CECONY	$	2,321		$	2,309		$	—		$	—		$	235	$	221	$	346		$	380
O&R
Electric	$	146		$	129		$	—		$	—		$	10	$	9	$	14		$	16
Gas		35			35			—			—			4		4		(1	)		1
Total O&R	$	181		$	164		$	—		$	—		$	14	$	13	$	13		$	17
Competitive energy businesses	$	317		$	300		$	2		$	2		$	5	$	2	$	27		$	78
Other*		(1	)		(2	)		(2	)		(2	)		1		—		—			—
Total Con Edison	$	2,818		$	2,771		$	—		$	—		$	255	$	236	$	386		$	475

*	Parent company expenses, primarily interest, and consolidation adjustments. Other does not represent a business segment.


	For the Six Months Ended June 30,
	Operating revenues						Inter-segment revenues						Depreciation and amortization				Operating income
*(Millions of Dollars)*	2013			2012			2013			2012			2013		2012		2013		2012
CECONY
Electric	$	3,686		$	3,696		$	8		$	7		$	371	$	348	$	495	$	573
Gas		991			828			3			3			64		59		296		275
Steam		450			346			38			38			33		32		115		77
Consolidation adjustments		—			—			(49	)		(48	)		—		—		—		—
Total CECONY	$	5,127		$	4,870		$	—		$	—		$	468	$	439	$	906	$	925
O&R
Electric	$	291		$	257		$	—		$	—		$	20	$	19	$	34	$	24
Gas		117			117			—			—			8		7		27		31
Total O&R	$	408		$	374		$	—		$	—		$	28	$	26	$	61	$	55
Competitive energy businesses	$	469		$	610		$	4		$	4		$	10	$	4	$	(56)	$	59
Other*		(1	)		(5	)		(4	)		(4	)		—		—		1		(3	)
Total Con Edison	$	6,003		$	5,849		$	—		$	—		$	506	$	469	$	912	$	1,036

*	Parent company expenses, primarily interest, and consolidation adjustments. Other does not represent a business segment.

CECONY [Member]

Financial Information by Business Segment

Note J — Financial Information by Business Segment

The financial data for the business segments are as follows:


	For the Three Months Ended June 30,
	Operating revenues						Inter-segment revenues						Depreciation and amortization				Operating income
*(Millions of Dollars)*	2013			2012			2013			2012			2013		2012		2013			2012
CECONY
Electric	$	1,872		$	1,961		$	4		$	4		$	186	$	175	$	307		$	348
Gas		331			265			2			2			32		30		53			54
Steam		118			83			19			19			17		16		(14	)		(22	)
Consolidation adjustments		—			—			(25	)		(25	)		—		—		—			—
Total CECONY	$	2,321		$	2,309		$	—		$	—		$	235	$	221	$	346		$	380
O&R
Electric	$	146		$	129		$	—		$	—		$	10	$	9	$	14		$	16
Gas		35			35			—			—			4		4		(1	)		1
Total O&R	$	181		$	164		$	—		$	—		$	14	$	13	$	13		$	17
Competitive energy businesses	$	317		$	300		$	2		$	2		$	5	$	2	$	27		$	78
Other*		(1	)		(2	)		(2	)		(2	)		1		—		—			—
Total Con Edison	$	2,818		$	2,771		$	—		$	—		$	255	$	236	$	386		$	475

*	Parent company expenses, primarily interest, and consolidation adjustments. Other does not represent a business segment.


	For the Six Months Ended June 30,
	Operating revenues						Inter-segment revenues						Depreciation and amortization				Operating income
*(Millions of Dollars)*	2013			2012			2013			2012			2013		2012		2013		2012
CECONY
Electric	$	3,686		$	3,696		$	8		$	7		$	371	$	348	$	495	$	573
Gas		991			828			3			3			64		59		296		275
Steam		450			346			38			38			33		32		115		77
Consolidation adjustments		—			—			(49	)		(48	)		—		—		—		—
Total CECONY	$	5,127		$	4,870		$	—		$	—		$	468	$	439	$	906	$	925
O&R
Electric	$	291		$	257		$	—		$	—		$	20	$	19	$	34	$	24
Gas		117			117			—			—			8		7		27		31
Total O&R	$	408		$	374		$	—		$	—		$	28	$	26	$	61	$	55
Competitive energy businesses	$	469		$	610		$	4		$	4		$	10	$	4	$	(56)	$	59
Other*		(1	)		(5	)		(4	)		(4	)		—		—		1		(3	)
Total Con Edison	$	6,003		$	5,849		$	—		$	—		$	506	$	469	$	912	$	1,036

*	Parent company expenses, primarily interest, and consolidation adjustments. Other does not represent a business segment.

Derivative Instruments and Hedging Activities

6 Months Ended

Jun. 30, 2013

Derivative Instruments and Hedging Activities

Note K – Derivative Instruments and Hedging Activities

Under the accounting rules for derivatives and hedging, derivatives are recognized on the balance sheet at fair value, unless an exception is available under the accounting rules. Certain qualifying derivative contracts have been designated as normal purchases or normal sales contracts. These contracts are not reported at fair value under the accounting rules.

Energy Price Hedging

Con Edison’s subsidiaries hedge market price fluctuations associated with physical purchases and sales of electricity, natural gas, and steam by using derivative instruments including futures, forwards, basis swaps, options, transmission congestion contracts and financial transmission rights contracts.

Effective January 1, 2013, the Companies adopted Accounting Standards Updates (ASUs) No. 2011-11, “Balance Sheet (Topic 210): Disclosures about Offsetting Assets and Liabilities” and No. 2013-01, “Balance Sheet (Topic 210): Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities”. The amendments require the Companies to disclose certain quantitative information concerning financial and derivative instruments that are offset in the balance sheet and a description of the rights of setoff, including the nature of such rights, associated with recognized assets and liabilities that are subject to an enforceable master netting arrangement or similar agreement.

The Companies’ enter into master agreements for their commodity derivatives. These agreements typically provide setoff in the event of contract termination. In such case, generally the non-defaulting or non-affected party’s payable will be set-off by the other party’s payable. The non-defaulting party will customarily notify the defaulting party within a specific time period and come to an agreement on the early termination amount.

The fair values of the Companies’ commodity derivatives including the offsetting of assets and liabilities at June 30, 2013 were:


*(Millions of Dollars)*
Commodity Derivatives	Gross Amounts of Recognized Assets/(Liabilities)			Gross Amounts Offset in the Statement of Financial Position			Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position			Gross Amounts Not Offset in the Statement of Financial Position				Net Amount
										Financial instruments		Cash collateral received
Con Edison
Derivative assets		$ 78			$(49	)		$ 29	(a)		$—		$—		$ 29	(a)
Derivative liabilities		(146	)		87			(59	)						(59	)
Net derivative assets/(liabilities)		$ (68	)		$ 38			$(30	)(a)		$—		$—		$(30	)(a)
CECONY
Derivative assets		$ 22			$(13	)		$ 9	(a)		$—		$—		$ 9	(a)
Derivative liabilities		(71	)		37			(34	)						(34	)
Net derivative assets/(liabilities)		$ (49	)		$ 24			$(25	)(a)		$—		$—		$(25	)(a)

(a)

At June 30, 2013, Con Edison and CECONY had margin deposits of $31 million and $15 million, respectively, classified as derivative assets in the balance sheet, but not included in the table. As required by an exchange, a margin is collateral, typically cash, that the holder of a derivative instrument has to deposit in order to transact on an exchange and to cover its potential losses with its broker or the exchange.

The fair values of the Companies’ commodity derivatives including the offsetting of assets and liabilities at December 31, 2012 were:


*(Millions of Dollars)*
Commodity Derivatives	Gross Amounts of Recognized Assets/ (Liabilities)			Gross Amounts Offset in the Statement of Financial Position			Net Amounts of Assets/ (Liabilities) Presented in the Statement of Financial Position			Gross Amounts Not Offset in the Statement of Financial Position				Net Amount
										Financial instruments		Cash collateral received
Con Edison
Derivative assets		$ 86			$ (57	)		$ 29	(a)		$ —		$ —		$ 29	(a)
Derivative liabilities		(176	)		104			(72	)		—		—		(72	)
Net derivative assets/(liabilities)		$ (90	)		$ 47			$ (43	)(a)		$ —		$ —		$ (43	)(a)
CECONY
Derivative assets		$ 27			$ (15	)		$ 12	(a)		$ —		$ —		$ 12	(a)
Derivative liabilities		(83	)		44			(39	)		—		—		(39	)
Net derivative assets/(liabilities)		$ (56	)		$ 29			$ (27	)(a)		$ —		$ —		$ (27	)(a)

(a)

At December 31, 2012, Con Edison and CECONY had margin deposits of $37 million and $18 million, respectively, classified as derivative assets in the balance sheet, but not included in the table. As required by an exchange, a margin is collateral, typically cash, that the holder of a derivative instrument has to deposit in order to transact on an exchange and to cover its potential losses with its broker or the exchange.

Credit Exposure

The Companies are exposed to credit risk related to transactions entered into primarily for the various energy supply and hedging activities by the Utilities and the competitive energy businesses. The Companies use credit policies to manage this risk, including an established credit approval process, monitoring of counterparty limits, netting provisions within agreements, collateral or prepayment arrangements, credit insurance and credit default swaps.

At June 30, 2013, Con Edison and CECONY had $146 million and $15 million of credit exposure in connection with energy supply and hedging activities, net of collateral, respectively. Con Edison’s net credit exposure consisted of $69 million with independent system operators, $38 million with investment-grade counterparties, $37 million with commodity exchange brokers and $2 million with non-investment grade/non-rated counterparties. CECONY’s entire net credit exposure was with commodity exchange brokers.

Economic Hedges

The Companies enter into certain derivative instruments that do not qualify or are not designated as hedges under the accounting rules for derivatives and hedging. However, management believes these instruments represent economic hedges that mitigate exposure to fluctuations in commodity prices.

The fair values of the Companies’ commodity derivatives at June 30, 2013 were:



*(Millions of Dollars)*	Fair Value of Commodity Derivatives(a) Balance Sheet Location	Con Edison			CECONY
Derivative Assets
Current	Other current assets		$ 56			$ 15
Long-term	Other deferred charges and noncurrent assets		22			7
Total derivative assets			$ 78			$ 22
Impact of netting			(18	)		2
Net derivative assets			$ 60			$ 24
Derivative Liabilities
Current	Fair value of derivative liabilities		$ 91			$ 48
Long-term	Fair value of derivative liabilities		55			23
Total derivative liabilities			$ 146			$ 71
Impact of netting			(87	)		(37	)
Net derivative liabilities			$ 59			$ 34

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

The fair values of the Companies’ commodity derivatives at December 31, 2012 were:


*(Millions of Dollars)*	Fair Value of Commodity Derivatives(a) Balance Sheet Location	Con Edison			CECONY
Derivative Assets
Current	Other current assets		$ 64			$ 18
Long-term	Other deferred charges and noncurrent assets		22			9
Total derivative assets			$ 86			$ 27
Impact of netting			(20	)		3
Net derivative assets			$ 66			$ 30
Derivative Liabilities
Current	Fair value of derivative liabilities		$122			$ 58
Long-term	Fair value of derivative liabilities		54			25
Total derivative liabilities			$176			$ 83
Impact of netting			(104	)		(44	)
Net derivative liabilities			$ 72			$ 39

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

The Utilities generally recover all of their prudently incurred fuel, purchased power and gas cost, including hedging gains and losses, in accordance with rate provisions approved by the applicable state utility commissions. In accordance with the accounting rules for regulated operations, the Utilities record a regulatory asset or liability to defer recognition of unrealized gains and losses on their electric and gas derivatives. As gains and losses are realized in future periods, they will be recognized as purchased power, gas and fuel costs in the Companies’ consolidated income statements. Con Edison’s competitive energy businesses record realized and unrealized gains and losses on their derivative contracts in earnings in the reporting period in which they occur.

The following tables present the changes in the fair values of commodity derivatives that have been deferred or recognized in earnings for the three and six months ended June 30, 2013:


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Three Months Ended June 30, 2013
*(Millions of Dollars)*	Balance Sheet Location	Con Edison			CECONY
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains		$ (7	)		$ (7	)
Long-term	Regulatory liabilities		(2	)		(1	)
Total deferred gains/(losses)			$ (9	)		$ (8	)
Current	Deferred derivative losses		$ (24	)		$ (23	)
Current	Recoverable energy costs		(14	)		(12	)
Long-term	Deferred derivative losses		(10	)		(6	)
Total deferred gains/(losses)			$ (48	)		$ (41	)
Net deferred gains/(losses)			$ (57	)		$ (49	)
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense		$ (37	)(b)		$ —
	Gas purchased for resale		(7	)		—
	Non-utility revenue		2	(b)		—
Total pre-tax gain/(loss) recognized in income			$ (42	)		$ —

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	For the three months ended June 30, 2013, Con Edison recorded in non-utility operating revenues and purchased power expense an unrealized pre-tax gain/(loss)of $(1) million and $(29) million, respectively.


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Six Months Ended June 30, 2013
*(Millions of Dollars)*	Balance Sheet Location	Con Edison			CECONY
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains		$ 2			$ 1
Long-term	Regulatory liabilities		—			—
Total deferred gains/(losses)			$ 2			$ 1
Current	Deferred derivative losses		$ 14			$ 9
Current	Recoverable energy costs		(3	)		(2	)
Long-term	Deferred derivative losses		(3	)		—
Total deferred gains/(losses)			$ 8			$ 7
Net deferred gains/(losses)			$ 10			$ 8
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense		$ 30	(b)		$ —
	Gas purchased for resale		(11	)		—
	Non-utility revenue		1	(b)		—
Total pre-tax gain/(loss) recognized in income			$ 20			$ —

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	For the six months ended June 30, 2013, Con Edison recorded in purchased power expense an unrealized pre-tax gain/(loss) of $16 million.

The following tables present the changes in the fair values of commodity derivatives that have been deferred or recognized in earnings for the three and six months ended June 30, 2012:


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Three Months Ended June 30, 2012
*(Millions of Dollars)*	Balance Sheet Location	Con Edison			CECONY
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains		$ (1	)		$ (1	)
Total deferred gains/(losses)			$ (1	)		$ (1	)
Current	Deferred derivative losses		$ 66			$ 55
Current	Recoverable energy costs		(63	)		(56	)
Long-term	Deferred derivative losses		8			16
Total deferred gains(losses)			$ 11			$ 15
Net deferred gains/(losses)			$ 10			$ 14
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense		$ 27	(b)		$ —
	Gas purchased for resale		(1	)		—
	Non-utility revenue		(8	)(b)		—
Total pre-tax gain/(loss) recognized in income			$ 18			$ —

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	For the three months ended June 30, 2012, Con Edison recorded in non-utility revenues and purchased power expense an unrealized pre-tax (loss)/gain of $(9) million and $72 million, respectively.


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Six Months Ended June 30, 2012
*(Millions of Dollars)*	Balance Sheet Location	Con Edison			CECONY
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains		$ —			$ —
Total deferred gains/(losses)			$ —			$ —
Current	Deferred derivative losses		$ 38			$ 36
Current	Recoverable energy costs		(127	)		(112	)
Long-term	Deferred derivative losses		(11	)		(1	)
Total deferred gains/(losses)			$(100	)		$ (77	)
Net deferred gains/(losses)			$(100	)		$ (77	)
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense		$ (59	)(b)		$ —
	Gas purchased for resale		(2)			—
	Non-utility revenue		(11	)(b)		—
Total pre-tax gain/(loss) recognized in income			$ (72	)		$ —

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	For the six months ended June 30, 2012, Con Edison recorded in non-utility revenues and purchased power expense an unrealized pre-tax (loss)/gain of $(13) million and $45 million, respectively.

As of June 30, 2013, Con Edison had 1,188 contracts, including 620 CECONY contracts, which were considered to be derivatives under the accounting rules for derivatives and hedging (excluding qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts). The following table presents the number of contracts by commodity type:


	Electric Derivatives								Gas Derivatives
	Number of Energy Contracts (a)		MWHs (b)		Number of Capacity Contracts (a)		MWs (b)		Number of Contracts (a)		Dths (b)		Total Number Of Contracts (a)
Con Edison		498		15,234,227		72		11,712		618		81,575,092		1,188
CECONY		91		3,674,400		—		—		529		76,570,000		620

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	Volumes are reported net of long and short positions.

The Companies also enter into electric congestion and gas basis swap contracts to hedge the congestion and transportation charges which are associated with electric and gas contracts and hedged volumes.

The collateral requirements associated with, and settlement of, derivative transactions are included in net cash flows from operating activities in the Companies’ consolidated statement of cash flows. Most derivative instrument contracts contain provisions that may require the Companies to provide collateral on derivative instruments in net liability positions. The amount of collateral to be provided will depend on the fair value of the derivative instruments and the Companies’ credit ratings.

The aggregate fair value of all derivative instruments with credit-risk-related contingent features that are in a net liability position and collateral posted at June 30, 2013, and the additional collateral that would have been required to be posted had the lowest applicable credit rating been reduced one level and to below investment grade were:


*(Millions of Dollars)*	Con Edison (a)			CECONY (a)
Aggregate fair value – net liabilities		$39			$33
Collateral posted		$ —			$ —
Additional collateral (b) (downgrade one level from current ratings)		$ —			$ —
Additional collateral (b) (downgrade to below investment grade from current ratings)		$50	(c)		$37	(c)

(a)

Non-derivative transactions for the purchase and sale of electricity and gas and qualifying derivative instruments, which have been designated as normal purchases or normal sales, are excluded from the table. These transactions primarily include purchases of electricity from independent system operators. In the event the Utilities and Con Edison’s competitive energy businesses were no longer extended unsecured credit for such purchases, the Companies would be required to post collateral, which at June 30, 2013, would have amounted to an estimated $15 million and $0 for Con Edison and CECONY, respectively. For certain other such non-derivative transactions, the Companies could be required to post collateral under certain circumstances, including in the event counterparties had reasonable grounds for insecurity.

(b)

The Companies measure the collateral requirements by taking into consideration the fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liabilities position plus amounts owed to counterparties for settled transactions and amounts required by counterparties for minimum financial security. The fair value amounts represent unrealized losses, net of any unrealized gains where the Companies have a legally enforceable right of setoff.

(c)	Derivative instruments that are net assets have been excluded from the table. At June 30, 2013, if Con Edison had been downgraded to below investment grade, it would have been required to post additional collateral for such derivative instruments of $58 million, including $0 for CECONY.

Interest Rate Swap

O&R has an interest rate swap pursuant to which it pays a fixed-rate of 6.09 percent and receives a LIBOR-based variable rate. The fair value of this interest rate swap at June 30, 2013 was an unrealized loss of $4 million, which has been included in Con Edison’s consolidated balance sheet as a noncurrent liability/fair value of derivative liabilities and a regulatory asset. The increase in the fair value of the swap for the three and six months ended June 30, 2013 was $1 million and $2 million, respectively. In the event O&R’s credit rating was downgraded to BBB- or lower by S&P or Baa3 or lower by Moody’s, the swap counterparty could elect to terminate the agreement and, if it did so, the parties would then be required to settle the transaction.

CECONY [Member]

Derivative Instruments and Hedging Activities

Note K – Derivative Instruments and Hedging Activities

Energy Price Hedging

The fair values of the Companies’ commodity derivatives including the offsetting of assets and liabilities at June 30, 2013 were:


*(Millions of Dollars)*
Commodity Derivatives	Gross Amounts of Recognized Assets/(Liabilities)			Gross Amounts Offset in the Statement of Financial Position			Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position			Gross Amounts Not Offset in the Statement of Financial Position				Net Amount
										Financial instruments		Cash collateral received
Con Edison
Derivative assets		$ 78			$(49	)		$ 29	(a)		$—		$—		$ 29	(a)
Derivative liabilities		(146	)		87			(59	)						(59	)
Net derivative assets/(liabilities)		$ (68	)		$ 38			$(30	)(a)		$—		$—		$(30	)(a)
CECONY
Derivative assets		$ 22			$(13	)		$ 9	(a)		$—		$—		$ 9	(a)
Derivative liabilities		(71	)		37			(34	)						(34	)
Net derivative assets/(liabilities)		$ (49	)		$ 24			$(25	)(a)		$—		$—		$(25	)(a)

(a)

The fair values of the Companies’ commodity derivatives including the offsetting of assets and liabilities at December 31, 2012 were:


*(Millions of Dollars)*
Commodity Derivatives	Gross Amounts of Recognized Assets/ (Liabilities)			Gross Amounts Offset in the Statement of Financial Position			Net Amounts of Assets/ (Liabilities) Presented in the Statement of Financial Position			Gross Amounts Not Offset in the Statement of Financial Position				Net Amount
										Financial instruments		Cash collateral received
Con Edison
Derivative assets		$ 86			$ (57	)		$ 29	(a)		$ —		$ —		$ 29	(a)
Derivative liabilities		(176	)		104			(72	)		—		—		(72	)
Net derivative assets/(liabilities)		$ (90	)		$ 47			$ (43	)(a)		$ —		$ —		$ (43	)(a)
CECONY
Derivative assets		$ 27			$ (15	)		$ 12	(a)		$ —		$ —		$ 12	(a)
Derivative liabilities		(83	)		44			(39	)		—		—		(39	)
Net derivative assets/(liabilities)		$ (56	)		$ 29			$ (27	)(a)		$ —		$ —		$ (27	)(a)

(a)

Credit Exposure

Economic Hedges

The fair values of the Companies’ commodity derivatives at June 30, 2013 were:



*(Millions of Dollars)*	Fair Value of Commodity Derivatives(a) Balance Sheet Location	Con Edison			CECONY
Derivative Assets
Current	Other current assets		$ 56			$ 15
Long-term	Other deferred charges and noncurrent assets		22			7
Total derivative assets			$ 78			$ 22
Impact of netting			(18	)		2
Net derivative assets			$ 60			$ 24
Derivative Liabilities
Current	Fair value of derivative liabilities		$ 91			$ 48
Long-term	Fair value of derivative liabilities		55			23
Total derivative liabilities			$ 146			$ 71
Impact of netting			(87	)		(37	)
Net derivative liabilities			$ 59			$ 34

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

The fair values of the Companies’ commodity derivatives at December 31, 2012 were:


*(Millions of Dollars)*	Fair Value of Commodity Derivatives(a) Balance Sheet Location	Con Edison			CECONY
Derivative Assets
Current	Other current assets		$ 64			$ 18
Long-term	Other deferred charges and noncurrent assets		22			9
Total derivative assets			$ 86			$ 27
Impact of netting			(20	)		3
Net derivative assets			$ 66			$ 30
Derivative Liabilities
Current	Fair value of derivative liabilities		$122			$ 58
Long-term	Fair value of derivative liabilities		54			25
Total derivative liabilities			$176			$ 83
Impact of netting			(104	)		(44	)
Net derivative liabilities			$ 72			$ 39

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

The following tables present the changes in the fair values of commodity derivatives that have been deferred or recognized in earnings for the three and six months ended June 30, 2013:


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Three Months Ended June 30, 2013
*(Millions of Dollars)*	Balance Sheet Location	Con Edison			CECONY
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains		$ (7	)		$ (7	)
Long-term	Regulatory liabilities		(2	)		(1	)
Total deferred gains/(losses)			$ (9	)		$ (8	)
Current	Deferred derivative losses		$ (24	)		$ (23	)
Current	Recoverable energy costs		(14	)		(12	)
Long-term	Deferred derivative losses		(10	)		(6	)
Total deferred gains/(losses)			$ (48	)		$ (41	)
Net deferred gains/(losses)			$ (57	)		$ (49	)
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense		$ (37	)(b)		$ —
	Gas purchased for resale		(7	)		—
	Non-utility revenue		2	(b)		—
Total pre-tax gain/(loss) recognized in income			$ (42	)		$ —

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	For the three months ended June 30, 2013, Con Edison recorded in non-utility operating revenues and purchased power expense an unrealized pre-tax gain/(loss)of $(1) million and $(29) million, respectively.


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Six Months Ended June 30, 2013
*(Millions of Dollars)*	Balance Sheet Location	Con Edison			CECONY
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains		$ 2			$ 1
Long-term	Regulatory liabilities		—			—
Total deferred gains/(losses)			$ 2			$ 1
Current	Deferred derivative losses		$ 14			$ 9
Current	Recoverable energy costs		(3	)		(2	)
Long-term	Deferred derivative losses		(3	)		—
Total deferred gains/(losses)			$ 8			$ 7
Net deferred gains/(losses)			$ 10			$ 8
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense		$ 30	(b)		$ —
	Gas purchased for resale		(11	)		—
	Non-utility revenue		1	(b)		—
Total pre-tax gain/(loss) recognized in income			$ 20			$ —

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	For the six months ended June 30, 2013, Con Edison recorded in purchased power expense an unrealized pre-tax gain/(loss) of $16 million.

The following tables present the changes in the fair values of commodity derivatives that have been deferred or recognized in earnings for the three and six months ended June 30, 2012:


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Three Months Ended June 30, 2012
*(Millions of Dollars)*	Balance Sheet Location	Con Edison			CECONY
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains		$ (1	)		$ (1	)
Total deferred gains/(losses)			$ (1	)		$ (1	)
Current	Deferred derivative losses		$ 66			$ 55
Current	Recoverable energy costs		(63	)		(56	)
Long-term	Deferred derivative losses		8			16
Total deferred gains(losses)			$ 11			$ 15
Net deferred gains/(losses)			$ 10			$ 14
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense		$ 27	(b)		$ —
	Gas purchased for resale		(1	)		—
	Non-utility revenue		(8	)(b)		—
Total pre-tax gain/(loss) recognized in income			$ 18			$ —

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	For the three months ended June 30, 2012, Con Edison recorded in non-utility revenues and purchased power expense an unrealized pre-tax (loss)/gain of $(9) million and $72 million, respectively.


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Six Months Ended June 30, 2012
*(Millions of Dollars)*	Balance Sheet Location	Con Edison			CECONY
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains		$ —			$ —
Total deferred gains/(losses)			$ —			$ —
Current	Deferred derivative losses		$ 38			$ 36
Current	Recoverable energy costs		(127	)		(112	)
Long-term	Deferred derivative losses		(11	)		(1	)
Total deferred gains/(losses)			$(100	)		$ (77	)
Net deferred gains/(losses)			$(100	)		$ (77	)
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense		$ (59	)(b)		$ —
	Gas purchased for resale		(2)			—
	Non-utility revenue		(11	)(b)		—
Total pre-tax gain/(loss) recognized in income			$ (72	)		$ —

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	For the six months ended June 30, 2012, Con Edison recorded in non-utility revenues and purchased power expense an unrealized pre-tax (loss)/gain of $(13) million and $45 million, respectively.


	Electric Derivatives								Gas Derivatives
	Number of Energy Contracts (a)		MWHs (b)		Number of Capacity Contracts (a)		MWs (b)		Number of Contracts (a)		Dths (b)		Total Number Of Contracts (a)
Con Edison		498		15,234,227		72		11,712		618		81,575,092		1,188
CECONY		91		3,674,400		—		—		529		76,570,000		620

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	Volumes are reported net of long and short positions.


*(Millions of Dollars)*	Con Edison (a)			CECONY (a)
Aggregate fair value – net liabilities		$39			$33
Collateral posted		$ —			$ —
Additional collateral (b) (downgrade one level from current ratings)		$ —			$ —
Additional collateral (b) (downgrade to below investment grade from current ratings)		$50	(c)		$37	(c)

(a)

(b)

(c)	Derivative instruments that are net assets have been excluded from the table. At June 30, 2013, if Con Edison had been downgraded to below investment grade, it would have been required to post additional collateral for such derivative instruments of $58 million, including $0 for CECONY.

Interest Rate Swap

Fair Value Measurements

6 Months Ended

Jun. 30, 2013

Fair Value Measurements

Note L — Fair Value Measurements

The accounting rules for fair value measurements and disclosures define fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date in a principal or most advantageous market. Fair value is a market-based measurement that is determined based on inputs, which refer broadly to assumptions that market participants use in pricing assets or liabilities. These inputs can be readily observable, market corroborated, or generally unobservable firm inputs. The Companies often make certain assumptions that market participants would use in pricing the asset or liability, including assumptions about risk, and the risks inherent in the inputs to valuation techniques. The Companies use valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs.

The accounting rules for fair value measurements and disclosures established a fair value hierarchy, which prioritizes the inputs to valuation techniques used to measure fair value in three broad levels. The rules require that assets and liabilities be classified in their entirety based on the level of input that is significant to the fair value measurement. Assessing the significance of a particular input may require judgment considering factors specific to the asset or liability, and may affect the valuation of the asset or liability and their placement within the fair value hierarchy. The Companies classify fair value balances based on the fair value hierarchy defined by the accounting rules for fair value measurements and disclosures as follows:

•

Level 1 – Consists of assets or liabilities whose value is based on unadjusted quoted prices in active markets at the measurement date. An active market is one in which transactions for assets or liabilities occur with sufficient frequency and volume to provide pricing information on an ongoing basis. This category includes contracts traded on active exchange markets valued using unadjusted prices quoted directly from the exchange.

•

Level 2 – Consists of assets or liabilities valued using industry standard models and based on prices, other than quoted prices within Level 1, that are either directly or indirectly observable as of the measurement date. The industry standard models consider observable assumptions including time value, volatility factors, and current market and contractual prices for the underlying commodities, in addition to other economic measures. This category includes contracts traded on active exchanges or in over-the-counter markets priced with industry standard models.

•

Level 3 – Consists of assets or liabilities whose fair value is estimated based on internally developed models or methodologies using inputs that are generally less readily observable and supported by little, if any, market activity at the measurement date. Unobservable inputs are developed based on the best available information and subject to cost benefit constraints. This category includes contracts priced using models that are internally developed and contracts placed in illiquid markets. It also includes contracts that expire after the period of time for which quoted prices are available and internal models are used to determine a significant portion of the value.

Assets and liabilities measured at fair value on a recurring basis as of June 30, 2013 are summarized below.


	Level 1				Level 2				Level 3				Netting Adjustments(d)						Total
*(Millions of Dollars)*	Con Edison		CECONY		Con Edison		CECONY		Con Edison		CECONY		Con Edison			CECONY			Con Edison		CECONY
Derivative assets:
Commodity (a)(e)		$ —		$ —		$ 54		$ 6		$13		$ 8		$ (7	)		$ 10			$ 60		$ 24
Other assets (c)(e)		128		121		110		101		—		—		—			—			238		222
Total		$128		$121		$164		$107		$13		$ 8		$ (7	)		$ 10			$298		$246
Derivative liabilities:
Commodity (a)(e)		$ 13		$ 13		$103		$ 50		$19		$—		$(76	)		$(29	)		$ 59		$ 34
Interest rate contract (b)(e)		—		—		4		—		—		—		—			—			4		—
Total		$ 13		$ 13		$107		$ 50		$19		$—		$(76	)		$(29	)		$ 63		$ 34

(a)	A portion of the commodity derivatives categorized in Level 3 is valued using an internally developed model with observable inputs. The models also include some less readily observable inputs resulting in the classification of the entire contract as Level 3. See Note K.

(b)	See Note K.

(c)	Other assets are comprised of assets such as life insurance contracts within the deferred compensation plan and non-qualified retirement plans.

(d)	Amounts represent the impact of legally-enforceable master netting agreements that allow the Companies to net gain and loss positions and cash collateral held or placed with the same counterparties.

(e)	The Companies’ policy is to recognize transfers into and transfers out of the levels at the end of the reporting period. There were no transfers between levels 1, 2, and 3 for the six months ended June 30, 2013.

Assets and liabilities measured at fair value on a recurring basis as of December 31, 2012 are summarized below.


	Level 1				Level 2				Level 3				Netting Adjustments(d)						Total
*(Millions of Dollars)*	Con Edison		CECONY		Con Edison		CECONY		Con Edison		CECONY		Con Edison			CECONY			Con Edison		CECONY
Derivative assets:
Commodity (a)(e)		$ —		$ —		$ 43		$ 8		$33		$10		$(10	)		$ 12			$ 66		$ 30
Other assets (c)(e)(f)		106		99		107		98		—		—		—			—			213		197
Total		$106		$99		$150		$106		$33		$10		$(10	)		$ 12			$279		$227
Derivative liabilities:
Commodity (a)(e)(h)		$ 12		$12		$116		$ 62		$38		$ —		$(94	)		$(35	)		$ 72		$ 39
Interest rate contract (b)(e)(g)		—		—		6		—		—		—		—			—			6		—
Total		$ 12		$12		$122		$ 62		$38		$ —		$(94	)		$(35	)		$ 78		$ 39

(a)

A significant portion of the commodity derivative contracts categorized in Level 3 is valued using either an industry acceptable model or an internally developed model with observable inputs. The models also include some less readily observable inputs resulting in the classification of the entire contract as Level 3. See Note K.

(b)	See Note K.

(c)	Other assets are comprised of assets such as life insurance contracts within the deferred compensation plan and non-qualified retirement plans.

(d)	Amounts represent the impact of legally-enforceable master netting agreements that allow the Companies to net gain and loss positions and cash collateral held or placed with the same counterparties.

(e)	The Companies’ policy is to recognize transfers into and transfers out of the levels at the end of the reporting period.

(f)	On March 31, 2012, other assets of $105 million for Con Edison and $95 million for CECONY were transferred from Level 3 to Level 2 because of reassessment of the levels in the fair value hierarchy within which certain inputs fall as of March 31, 2012.

(g)	On March 31, 2012, interest rate contract of $8 million was transferred from Level 3 to Level 2 because of reassessment of the levels in the fair value hierarchy within which certain inputs fall.

(h)

During 2012, Con Edison transferred commodity derivative contract liabilities of $2 million from Level 1 to Level 2, $9 million from Level 2 to Level 1, $2 million from Level 2 to Level 3, and $11 million from Level 3 to Level 2 because of reassessment of the levels in the fair value hierarchy within which certain inputs fall.

The employees in the risk management groups of the Utilities and the competitive energy businesses develop and maintain the Companies’ valuation policies and procedures for, and verify pricing and fair value valuation of, commodity derivatives. Under the Companies’ policies and procedures, multiple independent sources of information are obtained for forward price curves used to value commodity derivatives. Fair value and changes in fair value of commodity derivatives are reported on a monthly basis to the Companies’ risk committees, comprised of officers and employees of the Companies that oversee energy hedging at the Utilities and the competitive energy businesses. The managers of the risk management groups report to the Companies’ Vice President and Treasurer.

Fair Value of

Level 3 at
June 30, 2013

(Millions of Dollars)

Valuation

Techniques

Unobservable Inputs

Range

Con Edison—Commodity

Electricity

)

Discounted Cash Flow

Forward energy prices (a)

$20-$129 per MWH

Standard Offer Capacity Agreements

(15

)

Discounted Cash Flow

Forward capacity prices (a)

Present value factor (a)

$119-$248 MW - day

2.49%

Transmission Congestion Contracts / Financial Transmission Rights

Discounted Cash Flow

Discount to adjust auction prices for inter-zonal forward price curves (b)

Discount to adjust auction prices for historical monthly realized settlements (b)

17.5%-42.4%

8.5%-49%

Inter-zonal forward price curves adjusted for historical zonal losses (b)

$0.54-$12.68

Total Con Edison—Commodity

)

CECONY—Commodity

Transmission Congestion Contracts

Discounted Cash Flow

Discount to adjust auction prices for inter-zonal forward price curves (b)

17.5%-42.4%

Discount to adjust auction prices for historical monthly realized settlements (b)

8.5%-49%

(a)	Generally, increases/(decreases) in this input in isolation would result in a higher/(lower) fair value measurement.

(b)	Generally, increases/(decreases) in this input in isolation would result in a lower/(higher) fair value measurement.

The table listed below provides a reconciliation of the beginning and ending net balances for assets and liabilities measured at fair value as of June 30, 2013 and 2012 and classified as Level 3 in the fair value hierarchy:


	For Three Months Ended June 30, 2013
			Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of April 1, 2013		Included in Earnings			Included in Regulatory Assets and Liabilities			Purchases		Issuances		Sales		Settlements			Transfer In/Out of Level 3		Ending Balance as of June 30, 2013
Con Edison
Derivatives:
Commodity		$14		$(21	)		$(2	)		$2		$—		$—		$ 1			$—		$(6	)
CECONY
Derivatives:
Commodity		$11		$ (2	)		$—			$1		$—		$—		$(2	)		$—		$ 8


	For Six Months Ended June 30, 2013
				Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of January 1, 2013			Included in Earnings		Included in Regulatory Assets and Liabilities		Purchases		Issuances		Sales		Settlements			Transfer In/Out of Level 3		Ending Balance as of June 30, 2013
Con Edison
Derivatives:
Commodity		$ (5	)		$8		$3		$7		$—		$—		$(19	)		$—		$(6	)
CECONY
Derivatives:
Commodity		$10			$7		$1		$5		$—		$—		$(15	)		$—		$ 8


	For the Three Months Ended June 30, 2012
				Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of April 1, 2012			Included in Earnings			Included in Regulatory Assets and Liabilities		Purchases		Issuances		Sales		Settlements		Transfer In/Out of Level 3		Ending Balance as of June 30, 2012
Con Edison
Derivatives:
Commodity		$(93	)		$(24	)		$4		$5		$—		$—		$43		$4		$(61	)
CECONY
Derivatives:
Commodity		$(13	)		$(11	)		$4		$2		$—		$—		$ 6		$2		$(10	)


	For the Six Months Ended June 30, 2012
				Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of January 1, 2012			Included in Earnings			Included in Regulatory Assets and Liabilities			Purchases		Issuances		Sales		Settlements		Transfer In/Out of Level 3			Ending Balance as of June 30, 2012
Con Edison
Derivatives:
Commodity		$(62	)		$(82	)		$(13	)		$11		$—		$—		$81		$ 4			$(61	)
Interest rate contract		(8	)		(1	)		—			—		—		—		1		8	(b)		—
Other assets(a)		99			3			3			—		—		—		—		(105	)(b)		—
Total		$ 29			$(80	)		$(10	)		$11		$—		$—		$82		$ (93	)		$(61	)
CECONY
Derivatives:
Commodity		$ (7	)		$(16	)		$ (3	)		$ 8		$—		$—		$ 6		$ 2	(b)		$(10	)
Other assets(a)		90			3			2			—		—		—		—		(95	)(b)		—
Total		$ 83			$(13	)		$ (1	)		$ 8		$—		$—		$ 6		$ (93	)		$(10	)

(a)	Amounts included in earnings are reported in investment and other income on the consolidated income statement.

(b)	Other assets and interest rate contract were transferred as of March 31, 2012.

For the Utilities, realized gains and losses on Level 3 commodity derivative assets and liabilities are reported as part of purchased power, gas and fuel costs. The Utilities generally recover these costs in accordance with rate provisions approved by the applicable state public utilities commissions. Unrealized gains and losses for commodity derivatives are generally deferred on the consolidated balance sheet in accordance with the accounting rules for regulated operations.

For the competitive energy businesses, realized and unrealized gains and losses on Level 3 commodity derivative assets and liabilities are reported in non-utility revenues ($2 million loss and $6 million loss) and purchased power costs ($15 million loss and $1 million loss) on the consolidated income statement for the three months ended June 30, 2013 and 2012, respectively. Realized and unrealized gains and losses on Level 3 commodity derivative assets and liabilities are reported in non-utility revenues ($2 million loss and $9 million loss) and purchased power costs ($4 million gain and $44 million loss) on the consolidated income statement for the six months ended June 30, 2013 and 2012, respectively. The change in fair value relating to Level 3 commodity derivative assets held at June 30, 2013 and 2012 is included in non-utility revenues ($2 million loss and $6 million loss) and purchased power costs ($14 million loss and $31 million gain) on the consolidated income statement for the three months ended June 30, 2013 and 2012, respectively. For the six months ended June 30, 2013 and 2012, the change in fair value relating to Level 3 commodity derivative assets and liabilities is included in non-utility revenues ($2 million loss and $9 million loss) and purchased power costs ($2 million gain and $24 million gain) on the consolidated income statement, respectively.

The accounting rules for fair value measurements and disclosures require consideration of the impact of nonperformance risk (including credit risk) from a market participant perspective in the measurement of the fair value of assets and liabilities. At June 30, 2013, the Companies determined that nonperformance risk would have no material impact on their financial position or results of operations. To assess nonperformance risk, the Companies considered information such as collateral requirements, master netting arrangements, letters of credit and parent company guarantees, and applied a market-based method by using the counterparty (for an asset) or the Companies’ (for a liability) credit default swaps rates.

CECONY [Member]

Fair Value Measurements

Note L — Fair Value Measurements

•

Assets and liabilities measured at fair value on a recurring basis as of June 30, 2013 are summarized below.


	Level 1				Level 2				Level 3				Netting Adjustments(d)						Total
*(Millions of Dollars)*	Con Edison		CECONY		Con Edison		CECONY		Con Edison		CECONY		Con Edison			CECONY			Con Edison		CECONY
Derivative assets:
Commodity (a)(e)		$ —		$ —		$ 54		$ 6		$13		$ 8		$ (7	)		$ 10			$ 60		$ 24
Other assets (c)(e)		128		121		110		101		—		—		—			—			238		222
Total		$128		$121		$164		$107		$13		$ 8		$ (7	)		$ 10			$298		$246
Derivative liabilities:
Commodity (a)(e)		$ 13		$ 13		$103		$ 50		$19		$—		$(76	)		$(29	)		$ 59		$ 34
Interest rate contract (b)(e)		—		—		4		—		—		—		—			—			4		—
Total		$ 13		$ 13		$107		$ 50		$19		$—		$(76	)		$(29	)		$ 63		$ 34

(a)	A portion of the commodity derivatives categorized in Level 3 is valued using an internally developed model with observable inputs. The models also include some less readily observable inputs resulting in the classification of the entire contract as Level 3. See Note K.

(b)	See Note K.

(c)	Other assets are comprised of assets such as life insurance contracts within the deferred compensation plan and non-qualified retirement plans.

(d)	Amounts represent the impact of legally-enforceable master netting agreements that allow the Companies to net gain and loss positions and cash collateral held or placed with the same counterparties.

(e)	The Companies’ policy is to recognize transfers into and transfers out of the levels at the end of the reporting period. There were no transfers between levels 1, 2, and 3 for the six months ended June 30, 2013.

Assets and liabilities measured at fair value on a recurring basis as of December 31, 2012 are summarized below.


	Level 1				Level 2				Level 3				Netting Adjustments(d)						Total
*(Millions of Dollars)*	Con Edison		CECONY		Con Edison		CECONY		Con Edison		CECONY		Con Edison			CECONY			Con Edison		CECONY
Derivative assets:
Commodity (a)(e)		$ —		$ —		$ 43		$ 8		$33		$10		$(10	)		$ 12			$ 66		$ 30
Other assets (c)(e)(f)		106		99		107		98		—		—		—			—			213		197
Total		$106		$99		$150		$106		$33		$10		$(10	)		$ 12			$279		$227
Derivative liabilities:
Commodity (a)(e)(h)		$ 12		$12		$116		$ 62		$38		$ —		$(94	)		$(35	)		$ 72		$ 39
Interest rate contract (b)(e)(g)		—		—		6		—		—		—		—			—			6		—
Total		$ 12		$12		$122		$ 62		$38		$ —		$(94	)		$(35	)		$ 78		$ 39

(a)

(b)	See Note K.

(c)	Other assets are comprised of assets such as life insurance contracts within the deferred compensation plan and non-qualified retirement plans.

(d)	Amounts represent the impact of legally-enforceable master netting agreements that allow the Companies to net gain and loss positions and cash collateral held or placed with the same counterparties.

(e)	The Companies’ policy is to recognize transfers into and transfers out of the levels at the end of the reporting period.

(f)	On March 31, 2012, other assets of $105 million for Con Edison and $95 million for CECONY were transferred from Level 3 to Level 2 because of reassessment of the levels in the fair value hierarchy within which certain inputs fall as of March 31, 2012.

(g)	On March 31, 2012, interest rate contract of $8 million was transferred from Level 3 to Level 2 because of reassessment of the levels in the fair value hierarchy within which certain inputs fall.

(h)

Fair Value of

Level 3 at
June 30, 2013

(Millions of Dollars)

Valuation

Techniques

Unobservable Inputs

Range

Con Edison—Commodity

Electricity

)

Discounted Cash Flow

Forward energy prices (a)

$20-$129 per MWH

Standard Offer Capacity Agreements

(15

)

Discounted Cash Flow

Forward capacity prices (a)

Present value factor (a)

$119-$248 MW - day

2.49%

Transmission Congestion Contracts / Financial Transmission Rights

Discounted Cash Flow

Discount to adjust auction prices for inter-zonal forward price curves (b)

Discount to adjust auction prices for historical monthly realized settlements (b)

17.5%-42.4%

8.5%-49%

Inter-zonal forward price curves adjusted for historical zonal losses (b)

$0.54-$12.68

Total Con Edison—Commodity

)

CECONY—Commodity

Transmission Congestion Contracts

Discounted Cash Flow

Discount to adjust auction prices for inter-zonal forward price curves (b)

17.5%-42.4%

Discount to adjust auction prices for historical monthly realized settlements (b)

8.5%-49%

(a)	Generally, increases/(decreases) in this input in isolation would result in a higher/(lower) fair value measurement.

(b)	Generally, increases/(decreases) in this input in isolation would result in a lower/(higher) fair value measurement.


	For Three Months Ended June 30, 2013
			Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of April 1, 2013		Included in Earnings			Included in Regulatory Assets and Liabilities			Purchases		Issuances		Sales		Settlements			Transfer In/Out of Level 3		Ending Balance as of June 30, 2013
Con Edison
Derivatives:
Commodity		$14		$(21	)		$(2	)		$2		$—		$—		$ 1			$—		$(6	)
CECONY
Derivatives:
Commodity		$11		$ (2	)		$—			$1		$—		$—		$(2	)		$—		$ 8


	For Six Months Ended June 30, 2013
				Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of January 1, 2013			Included in Earnings		Included in Regulatory Assets and Liabilities		Purchases		Issuances		Sales		Settlements			Transfer In/Out of Level 3		Ending Balance as of June 30, 2013
Con Edison
Derivatives:
Commodity		$ (5	)		$8		$3		$7		$—		$—		$(19	)		$—		$(6	)
CECONY
Derivatives:
Commodity		$10			$7		$1		$5		$—		$—		$(15	)		$—		$ 8


	For the Three Months Ended June 30, 2012
				Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of April 1, 2012			Included in Earnings			Included in Regulatory Assets and Liabilities		Purchases		Issuances		Sales		Settlements		Transfer In/Out of Level 3		Ending Balance as of June 30, 2012
Con Edison
Derivatives:
Commodity		$(93	)		$(24	)		$4		$5		$—		$—		$43		$4		$(61	)
CECONY
Derivatives:
Commodity		$(13	)		$(11	)		$4		$2		$—		$—		$ 6		$2		$(10	)


	For the Six Months Ended June 30, 2012
				Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of January 1, 2012			Included in Earnings			Included in Regulatory Assets and Liabilities			Purchases		Issuances		Sales		Settlements		Transfer In/Out of Level 3			Ending Balance as of June 30, 2012
Con Edison
Derivatives:
Commodity		$(62	)		$(82	)		$(13	)		$11		$—		$—		$81		$ 4			$(61	)
Interest rate contract		(8	)		(1	)		—			—		—		—		1		8	(b)		—
Other assets(a)		99			3			3			—		—		—		—		(105	)(b)		—
Total		$ 29			$(80	)		$(10	)		$11		$—		$—		$82		$ (93	)		$(61	)
CECONY
Derivatives:
Commodity		$ (7	)		$(16	)		$ (3	)		$ 8		$—		$—		$ 6		$ 2	(b)		$(10	)
Other assets(a)		90			3			2			—		—		—		—		(95	)(b)		—
Total		$ 83			$(13	)		$ (1	)		$ 8		$—		$—		$ 6		$ (93	)		$(10	)

(a)	Amounts included in earnings are reported in investment and other income on the consolidated income statement.

(b)	Other assets and interest rate contract were transferred as of March 31, 2012.

Asset Retirement Obligations

6 Months Ended

Jun. 30, 2013

Asset Retirement Obligations

Note M — Asset Retirement Obligations

The Companies account for retirement obligations on their assets in accordance with the accounting rules for asset retirement obligations.

The Companies recorded asset retirement obligations associated with the removal of asbestos and asbestos-containing material in their buildings (other than generating station and substation building structures themselves), electric equipment, and steam and gas distribution systems. The Companies also recorded asset retirement obligations relating to gas pipelines abandoned in place. The estimates of future liabilities were developed using historical information, and where available, quoted prices from outside contractors.

The Companies did not record an asset retirement obligation for the removal of asbestos associated with the generating station and substation building structures themselves. For these building structures, the Companies were unable to reasonably estimate their asset retirement obligations because the Companies were unable to estimate the undiscounted retirement costs or the retirement dates and settlement dates. The amount of the undiscounted retirement costs could vary considerably depending on the disposition method for the building structures, and the method has not been determined. The Companies anticipate continuing to use these building structures in their businesses for an indefinite period, and so the retirement dates and settlement dates are not determinable.

The accrued liability for asset retirement obligations and the regulatory liabilities for allowance for cost of removal less salvage for the Companies at June 30, 2013 and December 31, 2012 were as follows:


	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Accrued liability — asset retirement obligations		$162		$159		$162		$158
Regulatory liabilities — allowance for cost of removal less salvage		$518		$503		$433		$420

CECONY [Member]

Asset Retirement Obligations

Note M — Asset Retirement Obligations

The Companies account for retirement obligations on their assets in accordance with the accounting rules for asset retirement obligations.


	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Accrued liability — asset retirement obligations		$162		$159		$162		$158
Regulatory liabilities — allowance for cost of removal less salvage		$518		$503		$433		$420

New Financial Accounting Standards	6 Months Ended
New Financial Accounting Standards	Jun. 30, 2013
New Financial Accounting Standards	Note N — New Financial Accounting Standards In December 2011 and January 2013, the Financial Accounting Standards Board (FASB) issued amendments to address and clarify the scope of the balance sheet off-setting disclosure guidance within Accounting Standards Codification (ASC) 210, “Balance Sheet.” ASU No. 2011-11 and ASU No. 2013-01, “Balance Sheet (Topic 210): Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities,” provide guidance that requires a reporting entity to disclose certain quantitative information concerning financial and derivative instruments that are offset in the balance sheet and a description of the rights of setoff, including the nature of such rights, associated with recognized assets and liabilities that are subject to an enforceable master netting arrangement or similar agreement. ASU No. 2013-01 clarifies that financial instruments subject to the disclosure guidance are (1) derivatives accounted for in accordance with ASC 815, Derivatives and Hedging, (2) repurchase agreements and reverse purchase agreements and (3) securities borrowing and securities lending transactions that are either offset in accordance with ASC Section 210-20-45 or Section 815-10-45 or subject to an enforceable master netting arrangement or similar agreement. A reporting entity electing gross presentation of such assets and liabilities in its balance sheet will still be subject to the same disclosure requirements. Both ASUs are applicable for fiscal years beginning on or after January 1, 2013, interim periods within those fiscal years, and retrospectively for all comparative periods presented. The application of this guidance does not have a material impact on the Companies’ financial position, results of operations and liquidity. See Note K. In February 2013, the FASB issued amendments to improve the reporting of reclassifications out of accumulated OCI through ASU No. 2013-02, “Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income.” The amendments require an entity to provide information either on the face of the financial statements or in a single footnote on significant amounts reclassified out of accumulated OCI and the related income statement line items to the extent an amount is reclassified in its entirety to net income under U.S. GAAP. For significant items not reclassified to net income in their entirety, an entity is required to cross-reference to other disclosures that provide additional information. For public entities, the amendments are effective prospectively for reporting periods beginning after December 15, 2012. The application of this guidance does not have a material impact on the Companies’ financial position, results of operations and liquidity. See Note A.
CECONY [Member]
New Financial Accounting Standards	Note N — New Financial Accounting Standards In December 2011 and January 2013, the Financial Accounting Standards Board (FASB) issued amendments to address and clarify the scope of the balance sheet off-setting disclosure guidance within Accounting Standards Codification (ASC) 210, “Balance Sheet.” ASU No. 2011-11 and ASU No. 2013-01, “Balance Sheet (Topic 210): Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities,” provide guidance that requires a reporting entity to disclose certain quantitative information concerning financial and derivative instruments that are offset in the balance sheet and a description of the rights of setoff, including the nature of such rights, associated with recognized assets and liabilities that are subject to an enforceable master netting arrangement or similar agreement. ASU No. 2013-01 clarifies that financial instruments subject to the disclosure guidance are (1) derivatives accounted for in accordance with ASC 815, Derivatives and Hedging, (2) repurchase agreements and reverse purchase agreements and (3) securities borrowing and securities lending transactions that are either offset in accordance with ASC Section 210-20-45 or Section 815-10-45 or subject to an enforceable master netting arrangement or similar agreement. A reporting entity electing gross presentation of such assets and liabilities in its balance sheet will still be subject to the same disclosure requirements. Both ASUs are applicable for fiscal years beginning on or after January 1, 2013, interim periods within those fiscal years, and retrospectively for all comparative periods presented. The application of this guidance does not have a material impact on the Companies’ financial position, results of operations and liquidity. See Note K. In February 2013, the FASB issued amendments to improve the reporting of reclassifications out of accumulated OCI through ASU No. 2013-02, “Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income.” The amendments require an entity to provide information either on the face of the financial statements or in a single footnote on significant amounts reclassified out of accumulated OCI and the related income statement line items to the extent an amount is reclassified in its entirety to net income under U.S. GAAP. For significant items not reclassified to net income in their entirety, an entity is required to cross-reference to other disclosures that provide additional information. For public entities, the amendments are effective prospectively for reporting periods beginning after December 15, 2012. The application of this guidance does not have a material impact on the Companies’ financial position, results of operations and liquidity. See Note A.

Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2013

Accounting Policies [Abstract]

Earnings Per Common Share

For the three and six months ended June 30, 2013 and 2012, basic and diluted earnings per share (EPS) for Con Edison are calculated as follows:


	For the Three Months Ended June 30,				For the Six Months Ended June 30,
*(Millions of Dollars, except per share amounts/Shares in Millions)*	2013		2012		2013		2012
Net income for common stock		$ 172		$ 214		$ 364		$ 491
Weighted average common shares outstanding – basic		292.9		292.9		292.9		292.9
Add: Incremental shares attributable to effect of potentially dilutive securities		1.4		1.5		1.4		1.5
Adjusted weighted average common shares outstanding – diluted		294.3		294.4		294.3		294.4
Net Income for common stock per common share – basic		$ 0.59		$ 0.73		$ 1.24		$ 1.68
Net Income for common stock per common share – diluted		$ 0.59		$ 0.73		$ 1.24		$ 1.67

Changes in Accumulated Other Comprehensive Income by Component

For the three and six months ended June 30, 2013, changes to accumulated other comprehensive income (OCI) for Con Edison and CECONY are as follows:


*(Millions of Dollars)*	Con Edison			CECONY
Accumulated OCI, net of taxes, at December 31, 2012		$(53	)		$ (9	)
OCI before reclassifications		1			—
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $1 and $- for Con Edison and CECONY, respectively (a)(b)		2			—
Total OCI, net of taxes, at March 31, 2013		$ 3			$ —
Accumulated OCI, net of taxes, at March 31, 2013 (b)		$(50	)		$ (9	)
OCI before reclassifications		—			—
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $1 and $- for Con Edison and CECONY, respectively (a)(b)		2			—
Total OCI, net of taxes, at June 30, 2013		$ 2			$ —
Accumulated OCI, net of taxes, at June 30, 2013 (b)		$(48	)		$ (9	)

(a)

(b)	Tax reclassified from accumulated OCI is reported in the income tax expense line item of the income statement.

Regulatory Matters (Tables)

6 Months Ended

Jun. 30, 2013

Text Block [Abstract]

Regulatory Assets and Liabilities

Regulatory Assets and Liabilities

Regulatory assets and liabilities at June 30, 2013 and December 31, 2012 were comprised of the following items:


	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Regulatory assets
Unrecognized pension and other postretirement costs		$5,227		$5,677		$4,985		$5,407
Future income tax		1,996		1,922		1,889		1,831
Environmental remediation costs		713		730		599		615
Deferred storm costs		454		432		336		309
Pension and other postretirement benefits deferrals		201		183		170		154
Revenue taxes		183		176		176		170
Net electric deferrals		92		102		92		102
Unamortized loss on reacquired debt		69		74		66		70
Surcharge for New York State assessment		55		73		53		68
Deferred derivative losses – long-term		41		40		20		20
O&R transition bond charges		36		39		—		—
Preferred stock redemption		29		29		29		29
Workers’ compensation		18		19		18		19
Property tax reconciliation		18		16		—		—
Other		172		193		162		178
Regulatory assets – long-term		9,304		9,705		8,595		8,972
Deferred derivative losses – current		55		69		51		60
Recoverable energy costs – current		1		5		—		—
Regulatory assets – current		56		74		51		60
Total Regulatory Assets		$9,360		$9,779		$8,646		$9,032
Regulatory liabilities
Allowance for cost of removal less salvage		$ 518		$ 503		$ 433		$ 420
Property tax reconciliation		273		187		273		187
Net unbilled revenue deferrals		137		136		137		136
Long-term interest rate reconciliation		83		62		83		62
World Trade Center settlement proceeds		62		62		62		62
Carrying charges on T&D net plant – electric and steam		26		31		14		13
Expenditure prudence proceeding		16		14		16		14
Other		278		207		251		183
Regulatory liabilities – long-term		1,393		1,202		1,269		1,077
Refundable energy costs – current		63		82		32		48
Revenue decoupling mechanism		23		72		21		68
Deferred derivative gains – current		2		—		1		—
Electric surcharge offset		—		29		—		29
Regulatory liabilities – current		88		183		54		145
Total Regulatory Liabilities		$1,481		$1,385		$1,323		$1,222

Capitalization (Tables)

6 Months Ended

Jun. 30, 2013

Regulated Operations [Abstract]

Carrying Amounts and Fair Values of Long-Term Debt

The carrying amounts and fair values of long-term debt are:


*(Millions of Dollars)*	June 30, 2013				December 31, 2012
Long-Term Debt (including current portion)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Con Edison		$10,977		$12,313		$10,768		$12,935
CECONY		$ 9,840		$10,991		$ 9,845		$11,751

Pension Benefits (Tables) (Pension benefits [Member])

6 Months Ended

Jun. 30, 2013

Pension benefits [Member]

Companies' Net Periodic Benefit Costs

The components of the Companies’ net periodic benefit costs for the three and six months ended June 30, 2013 and 2012 were as follows:


	For the Three Months Ended June 30,
	Con Edison						CECONY
*(Millions of Dollars)*	2013			2012			2013			2012
Service cost – including administrative expenses		$ 67			$ 59			$ 62			$ 55
Interest cost on projected benefit obligation		134			137			126			128
Expected return on plan assets		(187	)		(177	)		(178	)		(168	)
Recognition of net actuarial loss		208			177			197			168
Recognition of prior service costs		1			2			1			2
NET PERIODIC BENEFIT COST		$ 223			$ 198			$ 208			$ 185
Amortization of regulatory asset		1			1			1			1
TOTAL PERIODIC BENEFIT COST		$ 224			$ 199			$ 209			$ 186
Cost capitalized		(88	)		(68	)		(84	)		(63	)
Reconciliation to rate level		(30	)		3			(29	)		2
Cost charged to operating expenses		$ 106			$ 134			$ 96			$ 125


	For the Six Months Ended June 30,
	Con Edison						CECONY
*(Millions of Dollars)*	2013			2012			2013			2012
Service cost – including administrative expenses		$ 133			$ 118			$ 124			$ 110
Interest cost on projected benefit obligation		268			274			252			257
Expected return on plan assets		(375	)		(352	)		(356	)		(335	)
Recognition of net actuarial loss		416			354			394			335
Recognition of prior service costs		3			4			2			3
NET PERIODIC BENEFIT COST		$ 445			$ 398			$ 416			$ 370
Amortization of regulatory asset		1			1			1			1
TOTAL PERIODIC BENEFIT COST		$ 446			$ 399			$ 417			$ 371
Cost capitalized		(170	)		(135	)		(163	)		(126	)
Reconciliation to rate level		(24	)		(32	)		(23	)		(36	)
Cost charged to operating expenses		$ 252			$ 232			$ 231			$ 209

Other Postretirement Benefits (Tables) (Other Postretirement Benefits [Member])

6 Months Ended

Jun. 30, 2013

Other Postretirement Benefits [Member]

Net Periodic Postretirement Benefit Costs

The components of the Companies’ net periodic postretirement benefit costs for the three and six months ended June 30, 2013 and 2012 were as follows:


	For the Three Months Ended June 30,
	Con Edison						CECONY
*(Millions of Dollars)*	2013			2012			2013			2012
Service cost		$ 6			$ 6			$ 5			$ 5
Interest cost on accumulated other postretirement benefit obligation		13			18			12			15
Expected return on plan assets		(19	)		(21	)		(17	)		(18	)
Recognition of net actuarial loss		16			24			14			21
Recognition of prior service cost		(7	)		(5	)		(6	)		(4	)
Recognition of transition obligation		—			1			—			1
NET PERIODIC POSTRETIREMENT BENEFIT COST		$ 9			$ 23			$ 8			$ 20
Cost capitalized		(4	)		(8	)		(4	)		(7	)
Reconciliation to rate level		16			5			13			4
Cost charged to operating expenses		$ 21			$ 20			$ 17			$ 17


	For the Six Months Ended June 30,
	Con Edison						CECONY
*(Millions of Dollars)*	2013			2012			2013			2012
Service cost		$ 12			$ 13			$ 9			$ 10
Interest cost on accumulated other postretirement benefit obligation		27			36			23			32
Expected return on plan assets		(39	)		(42	)		(34	)		(38	)
Recognition of net actuarial loss		32			49			28			44
Recognition of prior service cost		(13	)		(11	)		(11	)		(9	)
Recognition of transition obligation		—			1			—			1
NET PERIODIC POSTRETIREMENT BENEFIT COST		$ 19			$ 46			$ 15			$ 40
Cost capitalized		(7	)		(16	)		(6	)		(14	)
Reconciliation to rate level		29			14			25			8
Cost charged to operating expenses		$ 41			$ 44			$ 34			$ 34

Environmental Matters (Tables)

6 Months Ended

Jun. 30, 2013

Environmental Remediation Obligations [Abstract]

Accrued Liabilities and Regulatory Assets

The accrued liabilities and regulatory assets related to Superfund Sites at June 30, 2013 and December 31, 2012 were as follows:


	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Accrued Liabilities:
Manufactured gas plant sites		$447		$462		$339		$351
Other Superfund Sites		75		83		74		82
Total		$522		$545		$413		$433
Regulatory assets		$713		$730		$599		$615

Environmental Remediation Costs

Environmental remediation costs incurred and insurance recoveries received related to Superfund Sites for the three and six months ended June 30, 2013 and 2012 were as follows:


	For the Three Months Ended June 30,
	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Remediation costs incurred		$14		$8		$13		$7
Insurance recoveries received		—		—		—		—


	For the Six Months Ended June 30,
	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Remediation costs incurred		$24		$15		$20		$14
Insurance recoveries received		—		—		—		—

Accrued Liability for Asbestos Suits and Workers' Compensation Proceedings

The accrued liability for asbestos suits and workers’ compensation proceedings (including those related to asbestos exposure) and the amounts deferred as regulatory assets for the Companies at June 30, 2013 and December 31, 2012 were as follows:


	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Accrued liability – asbestos suits		$10		$10		$10		$10
Regulatory assets – asbestos suits		$10		$10		$10		$10
Accrued liability – workers’ compensation		$93		$94		$88		$89
Regulatory assets – workers’ compensation		$18		$19		$18		$19

Other Material Contingencies (Tables)

6 Months Ended

Jun. 30, 2013

Commitments And Contingencies Disclosure [Abstract]

Schedule of Leveraged Lease Transactions Effect on Consolidated Income Statement

The effect on Con Edison’s consolidated income statement is as follows:


*(Millions of Dollars)*	For the Three Months Ended June 30, 2013			For the Six Months Ended June 30, 2013
Increase/(decrease) to non-utility operating revenues		$51			$ (70	)
(Increase)/decrease to other interest expense		—			(131	)
Income tax benefit/(expense)		(22	)		80
Total increase/(decrease) in net income		$29			$(121	)

Total Guarantees

A summary, by type and term, of Con Edison’s total guarantees at June 30, 2013 is as follows:


Guarantee Type	0 – 3 years		4 – 10 years		> 10 years		Total
	*(Millions of Dollars)*
Energy transactions		$777		$31		$28		$836
Intra-company guarantees		16		—		—		16
Other guarantees		31		—		—		31
Total		$824		$31		$28		$883

Financial Information by Business Segment (Tables)

6 Months Ended

Jun. 30, 2013

Segment Reporting [Abstract]

Financial Data for Business Segments

The financial data for the business segments are as follows:


	For the Three Months Ended June 30,
	Operating revenues						Inter-segment revenues						Depreciation and amortization				Operating income
*(Millions of Dollars)*	2013			2012			2013			2012			2013		2012		2013			2012
CECONY
Electric	$	1,872		$	1,961		$	4		$	4		$	186	$	175	$	307		$	348
Gas		331			265			2			2			32		30		53			54
Steam		118			83			19			19			17		16		(14	)		(22	)
Consolidation adjustments		—			—			(25	)		(25	)		—		—		—			—
Total CECONY	$	2,321		$	2,309		$	—		$	—		$	235	$	221	$	346		$	380
O&R
Electric	$	146		$	129		$	—		$	—		$	10	$	9	$	14		$	16
Gas		35			35			—			—			4		4		(1	)		1
Total O&R	$	181		$	164		$	—		$	—		$	14	$	13	$	13		$	17
Competitive energy businesses	$	317		$	300		$	2		$	2		$	5	$	2	$	27		$	78
Other*		(1	)		(2	)		(2	)		(2	)		1		—		—			—
Total Con Edison	$	2,818		$	2,771		$	—		$	—		$	255	$	236	$	386		$	475

*	Parent company expenses, primarily interest, and consolidation adjustments. Other does not represent a business segment.


	For the Six Months Ended June 30,
	Operating revenues						Inter-segment revenues						Depreciation and amortization				Operating income
*(Millions of Dollars)*	2013			2012			2013			2012			2013		2012		2013		2012
CECONY
Electric	$	3,686		$	3,696		$	8		$	7		$	371	$	348	$	495	$	573
Gas		991			828			3			3			64		59		296		275
Steam		450			346			38			38			33		32		115		77
Consolidation adjustments		—			—			(49	)		(48	)		—		—		—		—
Total CECONY	$	5,127		$	4,870		$	—		$	—		$	468	$	439	$	906	$	925
O&R
Electric	$	291		$	257		$	—		$	—		$	20	$	19	$	34	$	24
Gas		117			117			—			—			8		7		27		31
Total O&R	$	408		$	374		$	—		$	—		$	28	$	26	$	61	$	55
Competitive energy businesses	$	469		$	610		$	4		$	4		$	10	$	4	$	(56)	$	59
Other*		(1	)		(5	)		(4	)		(4	)		—		—		1		(3	)
Total Con Edison	$	6,003		$	5,849		$	—		$	—		$	506	$	469	$	912	$	1,036

*	Parent company expenses, primarily interest, and consolidation adjustments. Other does not represent a business segment.

Derivative Instruments and Hedging Activities (Tables)

6 Months Ended

Jun. 30, 2013

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Fair Values of Commodity Derivatives Including Offsetting of Assets and Liabilities

The fair values of the Companies’ commodity derivatives including the offsetting of assets and liabilities at June 30, 2013 were:


*(Millions of Dollars)*
Commodity Derivatives	Gross Amounts of Recognized Assets/(Liabilities)			Gross Amounts Offset in the Statement of Financial Position			Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position			Gross Amounts Not Offset in the Statement of Financial Position				Net Amount
										Financial instruments		Cash collateral received
Con Edison
Derivative assets		$ 78			$(49	)		$ 29	(a)		$—		$—		$ 29	(a)
Derivative liabilities		(146	)		87			(59	)						(59	)
Net derivative assets/(liabilities)		$ (68	)		$ 38			$(30	)(a)		$—		$—		$(30	)(a)
CECONY
Derivative assets		$ 22			$(13	)		$ 9	(a)		$—		$—		$ 9	(a)
Derivative liabilities		(71	)		37			(34	)						(34	)
Net derivative assets/(liabilities)		$ (49	)		$ 24			$(25	)(a)		$—		$—		$(25	)(a)

(a)

The fair values of the Companies’ commodity derivatives including the offsetting of assets and liabilities at December 31, 2012 were:


*(Millions of Dollars)*
Commodity Derivatives	Gross Amounts of Recognized Assets/ (Liabilities)			Gross Amounts Offset in the Statement of Financial Position			Net Amounts of Assets/ (Liabilities) Presented in the Statement of Financial Position			Gross Amounts Not Offset in the Statement of Financial Position				Net Amount
										Financial instruments		Cash collateral received
Con Edison
Derivative assets		$ 86			$ (57	)		$ 29	(a)		$ —		$ —		$ 29	(a)
Derivative liabilities		(176	)		104			(72	)		—		—		(72	)
Net derivative assets/(liabilities)		$ (90	)		$ 47			$ (43	)(a)		$ —		$ —		$ (43	)(a)
CECONY
Derivative assets		$ 27			$ (15	)		$ 12	(a)		$ —		$ —		$ 12	(a)
Derivative liabilities		(83	)		44			(39	)		—		—		(39	)
Net derivative assets/(liabilities)		$ (56	)		$ 29			$ (27	)(a)		$ —		$ —		$ (27	)(a)

(a)

Fair Values of Companies' Commodity Derivatives

The fair values of the Companies’ commodity derivatives at June 30, 2013 were:



*(Millions of Dollars)*	Fair Value of Commodity Derivatives(a) Balance Sheet Location	Con Edison			CECONY
Derivative Assets
Current	Other current assets		$ 56			$ 15
Long-term	Other deferred charges and noncurrent assets		22			7
Total derivative assets			$ 78			$ 22
Impact of netting			(18	)		2
Net derivative assets			$ 60			$ 24
Derivative Liabilities
Current	Fair value of derivative liabilities		$ 91			$ 48
Long-term	Fair value of derivative liabilities		55			23
Total derivative liabilities			$ 146			$ 71
Impact of netting			(87	)		(37	)
Net derivative liabilities			$ 59			$ 34

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

The fair values of the Companies’ commodity derivatives at December 31, 2012 were:


*(Millions of Dollars)*	Fair Value of Commodity Derivatives(a) Balance Sheet Location	Con Edison			CECONY
Derivative Assets
Current	Other current assets		$ 64			$ 18
Long-term	Other deferred charges and noncurrent assets		22			9
Total derivative assets			$ 86			$ 27
Impact of netting			(20	)		3
Net derivative assets			$ 66			$ 30
Derivative Liabilities
Current	Fair value of derivative liabilities		$122			$ 58
Long-term	Fair value of derivative liabilities		54			25
Total derivative liabilities			$176			$ 83
Impact of netting			(104	)		(44	)
Net derivative liabilities			$ 72			$ 39

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

Changes in Fair Values of Commodity Derivatives

The following tables present the changes in the fair values of commodity derivatives that have been deferred or recognized in earnings for the three and six months ended June 30, 2013:


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Three Months Ended June 30, 2013
*(Millions of Dollars)*	Balance Sheet Location	Con Edison			CECONY
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains		$ (7	)		$ (7	)
Long-term	Regulatory liabilities		(2	)		(1	)
Total deferred gains/(losses)			$ (9	)		$ (8	)
Current	Deferred derivative losses		$ (24	)		$ (23	)
Current	Recoverable energy costs		(14	)		(12	)
Long-term	Deferred derivative losses		(10	)		(6	)
Total deferred gains/(losses)			$ (48	)		$ (41	)
Net deferred gains/(losses)			$ (57	)		$ (49	)
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense		$ (37	)(b)		$ —
	Gas purchased for resale		(7	)		—
	Non-utility revenue		2	(b)		—
Total pre-tax gain/(loss) recognized in income			$ (42	)		$ —

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	For the three months ended June 30, 2013, Con Edison recorded in non-utility operating revenues and purchased power expense an unrealized pre-tax gain/(loss)of $(1) million and $(29) million, respectively.


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Six Months Ended June 30, 2013
*(Millions of Dollars)*	Balance Sheet Location	Con Edison			CECONY
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains		$ 2			$ 1
Long-term	Regulatory liabilities		—			—
Total deferred gains/(losses)			$ 2			$ 1
Current	Deferred derivative losses		$ 14			$ 9
Current	Recoverable energy costs		(3	)		(2	)
Long-term	Deferred derivative losses		(3	)		—
Total deferred gains/(losses)			$ 8			$ 7
Net deferred gains/(losses)			$ 10			$ 8
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense		$ 30	(b)		$ —
	Gas purchased for resale		(11	)		—
	Non-utility revenue		1	(b)		—
Total pre-tax gain/(loss) recognized in income			$ 20			$ —

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	For the six months ended June 30, 2013, Con Edison recorded in purchased power expense an unrealized pre-tax gain/(loss) of $16 million.

The following tables present the changes in the fair values of commodity derivatives that have been deferred or recognized in earnings for the three and six months ended June 30, 2012:


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Three Months Ended June 30, 2012
*(Millions of Dollars)*	Balance Sheet Location	Con Edison			CECONY
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains		$ (1	)		$ (1	)
Total deferred gains/(losses)			$ (1	)		$ (1	)
Current	Deferred derivative losses		$ 66			$ 55
Current	Recoverable energy costs		(63	)		(56	)
Long-term	Deferred derivative losses		8			16
Total deferred gains(losses)			$ 11			$ 15
Net deferred gains/(losses)			$ 10			$ 14
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense		$ 27	(b)		$ —
	Gas purchased for resale		(1	)		—
	Non-utility revenue		(8	)(b)		—
Total pre-tax gain/(loss) recognized in income			$ 18			$ —

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	For the three months ended June 30, 2012, Con Edison recorded in non-utility revenues and purchased power expense an unrealized pre-tax (loss)/gain of $(9) million and $72 million, respectively.


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Six Months Ended June 30, 2012
*(Millions of Dollars)*	Balance Sheet Location	Con Edison			CECONY
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Current	Deferred derivative gains		$ —			$ —
Total deferred gains/(losses)			$ —			$ —
Current	Deferred derivative losses		$ 38			$ 36
Current	Recoverable energy costs		(127	)		(112	)
Long-term	Deferred derivative losses		(11	)		(1	)
Total deferred gains/(losses)			$(100	)		$ (77	)
Net deferred gains/(losses)			$(100	)		$ (77	)
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense		$ (59	)(b)		$ —
	Gas purchased for resale		(2)			—
	Non-utility revenue		(11	)(b)		—
Total pre-tax gain/(loss) recognized in income			$ (72	)		$ —

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	For the six months ended June 30, 2012, Con Edison recorded in non-utility revenues and purchased power expense an unrealized pre-tax (loss)/gain of $(13) million and $45 million, respectively.

Number of Derivative Contracts by Commodity Type

The following table presents the number of contracts by commodity type:


	Electric Derivatives								Gas Derivatives
	Number of Energy Contracts (a)		MWHs (b)		Number of Capacity Contracts (a)		MWs (b)		Number of Contracts (a)		Dths (b)		Total Number Of Contracts (a)
Con Edison		498		15,234,227		72		11,712		618		81,575,092		1,188
CECONY		91		3,674,400		—		—		529		76,570,000		620

(a)	Qualifying derivative contracts, which have been designated as normal purchases or normal sales contracts, are not reported at fair value under the accounting rules for derivatives and hedging and, therefore, are excluded from the table.

(b)	Volumes are reported net of long and short positions.

Aggregate Fair Value of All Derivative Instruments with Credit-Risk-Related Contingent Features


*(Millions of Dollars)*	Con Edison (a)			CECONY (a)
Aggregate fair value – net liabilities		$39			$33
Collateral posted		$ —			$ —
Additional collateral (b) (downgrade one level from current ratings)		$ —			$ —
Additional collateral (b) (downgrade to below investment grade from current ratings)		$50	(c)		$37	(c)

(a)

(b)

(c)	Derivative instruments that are net assets have been excluded from the table. At June 30, 2013, if Con Edison had been downgraded to below investment grade, it would have been required to post additional collateral for such derivative instruments of $58 million, including $0 for CECONY.

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

Assets and liabilities measured at fair value on a recurring basis as of June 30, 2013 are summarized below.


	Level 1				Level 2				Level 3				Netting Adjustments(d)						Total
*(Millions of Dollars)*	Con Edison		CECONY		Con Edison		CECONY		Con Edison		CECONY		Con Edison			CECONY			Con Edison		CECONY
Derivative assets:
Commodity (a)(e)		$ —		$ —		$ 54		$ 6		$13		$ 8		$ (7	)		$ 10			$ 60		$ 24
Other assets (c)(e)		128		121		110		101		—		—		—			—			238		222
Total		$128		$121		$164		$107		$13		$ 8		$ (7	)		$ 10			$298		$246
Derivative liabilities:
Commodity (a)(e)		$ 13		$ 13		$103		$ 50		$19		$—		$(76	)		$(29	)		$ 59		$ 34
Interest rate contract (b)(e)		—		—		4		—		—		—		—			—			4		—
Total		$ 13		$ 13		$107		$ 50		$19		$—		$(76	)		$(29	)		$ 63		$ 34

(a)	A portion of the commodity derivatives categorized in Level 3 is valued using an internally developed model with observable inputs. The models also include some less readily observable inputs resulting in the classification of the entire contract as Level 3. See Note K.

(b)	See Note K.

(c)	Other assets are comprised of assets such as life insurance contracts within the deferred compensation plan and non-qualified retirement plans.

(d)	Amounts represent the impact of legally-enforceable master netting agreements that allow the Companies to net gain and loss positions and cash collateral held or placed with the same counterparties.

(e)	The Companies’ policy is to recognize transfers into and transfers out of the levels at the end of the reporting period. There were no transfers between levels 1, 2, and 3 for the six months ended June 30, 2013.

Assets and liabilities measured at fair value on a recurring basis as of December 31, 2012 are summarized below.


	Level 1				Level 2				Level 3				Netting Adjustments(d)						Total
*(Millions of Dollars)*	Con Edison		CECONY		Con Edison		CECONY		Con Edison		CECONY		Con Edison			CECONY			Con Edison		CECONY
Derivative assets:
Commodity (a)(e)		$ —		$ —		$ 43		$ 8		$33		$10		$(10	)		$ 12			$ 66		$ 30
Other assets (c)(e)(f)		106		99		107		98		—		—		—			—			213		197
Total		$106		$99		$150		$106		$33		$10		$(10	)		$ 12			$279		$227
Derivative liabilities:
Commodity (a)(e)(h)		$ 12		$12		$116		$ 62		$38		$ —		$(94	)		$(35	)		$ 72		$ 39
Interest rate contract (b)(e)(g)		—		—		6		—		—		—		—			—			6		—
Total		$ 12		$12		$122		$ 62		$38		$ —		$(94	)		$(35	)		$ 78		$ 39

(a)

(b)	See Note K.

(c)	Other assets are comprised of assets such as life insurance contracts within the deferred compensation plan and non-qualified retirement plans.

(d)	Amounts represent the impact of legally-enforceable master netting agreements that allow the Companies to net gain and loss positions and cash collateral held or placed with the same counterparties.

(e)	The Companies’ policy is to recognize transfers into and transfers out of the levels at the end of the reporting period.

(f)	On March 31, 2012, other assets of $105 million for Con Edison and $95 million for CECONY were transferred from Level 3 to Level 2 because of reassessment of the levels in the fair value hierarchy within which certain inputs fall as of March 31, 2012.

(g)	On March 31, 2012, interest rate contract of $8 million was transferred from Level 3 to Level 2 because of reassessment of the levels in the fair value hierarchy within which certain inputs fall.

(h)

Schedule of Commodity Derivatives

The managers of the risk management groups report to the Companies’ Vice President and Treasurer.

Fair Value of

Level 3 at
June 30, 2013

(Millions of Dollars)

Valuation

Techniques

Unobservable Inputs

Range

Con Edison—Commodity

Electricity

)

Discounted Cash Flow

Forward energy prices (a)

$20-$129 per MWH

Standard Offer Capacity Agreements

(15

)

Discounted Cash Flow

Forward capacity prices (a)

Present value factor (a)

$119-$248 MW - day

2.49%

Transmission Congestion Contracts / Financial Transmission Rights

Discounted Cash Flow

Discount to adjust auction prices for inter-zonal forward price curves (b)

Discount to adjust auction prices for historical monthly realized settlements (b)

17.5%-42.4%

8.5%-49%

Inter-zonal forward price curves adjusted for historical zonal losses (b)

$0.54-$12.68

Total Con Edison—Commodity

)

CECONY—Commodity

Transmission Congestion Contracts

Discounted Cash Flow

Discount to adjust auction prices for inter-zonal forward price curves (b)

17.5%-42.4%

Discount to adjust auction prices for historical monthly realized settlements (b)

8.5%-49%

(a)	Generally, increases/(decreases) in this input in isolation would result in a higher/(lower) fair value measurement.

(b)	Generally, increases/(decreases) in this input in isolation would result in a lower/(higher) fair value measurement.

Reconciliation of Beginning and Ending Net Balances for Assets and Liabilities Measured at Level 3 Fair Value


	For Three Months Ended June 30, 2013
			Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of April 1, 2013		Included in Earnings			Included in Regulatory Assets and Liabilities			Purchases		Issuances		Sales		Settlements			Transfer In/Out of Level 3		Ending Balance as of June 30, 2013
Con Edison
Derivatives:
Commodity		$14		$(21	)		$(2	)		$2		$—		$—		$ 1			$—		$(6	)
CECONY
Derivatives:
Commodity		$11		$ (2	)		$—			$1		$—		$—		$(2	)		$—		$ 8


	For Six Months Ended June 30, 2013
				Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of January 1, 2013			Included in Earnings		Included in Regulatory Assets and Liabilities		Purchases		Issuances		Sales		Settlements			Transfer In/Out of Level 3		Ending Balance as of June 30, 2013
Con Edison
Derivatives:
Commodity		$ (5	)		$8		$3		$7		$—		$—		$(19	)		$—		$(6	)
CECONY
Derivatives:
Commodity		$10			$7		$1		$5		$—		$—		$(15	)		$—		$ 8


	For the Three Months Ended June 30, 2012
				Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of April 1, 2012			Included in Earnings			Included in Regulatory Assets and Liabilities		Purchases		Issuances		Sales		Settlements		Transfer In/Out of Level 3		Ending Balance as of June 30, 2012
Con Edison
Derivatives:
Commodity		$(93	)		$(24	)		$4		$5		$—		$—		$43		$4		$(61	)
CECONY
Derivatives:
Commodity		$(13	)		$(11	)		$4		$2		$—		$—		$ 6		$2		$(10	)


	For the Six Months Ended June 30, 2012
				Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of January 1, 2012			Included in Earnings			Included in Regulatory Assets and Liabilities			Purchases		Issuances		Sales		Settlements		Transfer In/Out of Level 3			Ending Balance as of June 30, 2012
Con Edison
Derivatives:
Commodity		$(62	)		$(82	)		$(13	)		$11		$—		$—		$81		$ 4			$(61	)
Interest rate contract		(8	)		(1	)		—			—		—		—		1		8	(b)		—
Other assets(a)		99			3			3			—		—		—		—		(105	)(b)		—
Total		$ 29			$(80	)		$(10	)		$11		$—		$—		$82		$ (93	)		$(61	)
CECONY
Derivatives:
Commodity		$ (7	)		$(16	)		$ (3	)		$ 8		$—		$—		$ 6		$ 2	(b)		$(10	)
Other assets(a)		90			3			2			—		—		—		—		(95	)(b)		—
Total		$ 83			$(13	)		$ (1	)		$ 8		$—		$—		$ 6		$ (93	)		$(10	)

(a)	Amounts included in earnings are reported in investment and other income on the consolidated income statement.

(b)	Other assets and interest rate contract were transferred as of March 31, 2012.

Asset Retirement Obligations (Tables)

6 Months Ended

Jun. 30, 2013

Asset Retirement Obligation Disclosure [Abstract]

Accrued Liability for Asset Retirement Obligations and Regulatory Liabilities


	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Accrued liability — asset retirement obligations		$162		$159		$162		$158
Regulatory liabilities — allowance for cost of removal less salvage		$518		$503		$433		$420

Summary of Significant Accounting Policies - Earnings Per Common Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Net income for common stock	$ 172	$ 192	$ 214	$ 277	$ 364	$ 491
Weighted average common shares outstanding - basic	292.9		292.9		292.9	292.9
Add: Incremental shares attributable to effect of potentially dilutive securities	1.4		1.5		1.4	1.5
Adjusted weighted average common shares outstanding - diluted	294.3		294.4		294.3	294.4
Net Income for common stock per common share - basic	$ 0.59		$ 0.73		$ 1.24	$ 1.68
Net Income for common stock per common share - diluted	$ 0.59		$ 0.73		$ 1.24	$ 1.67

Summary of Significant Accounting Policies - Changes in Accumulated Other Comprehensive Income by Component (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accumulated OCI, net of taxes	$ (50)	$ (53)		$ (53)
OCI before reclassifications		1
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $1 and $- for Con Edison and CECONY, respectively	2	2
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAXES	2	3	(1)	5	6
Accumulated OCI, net of taxes	(48)	(50)		(48)
CECONY [Member]
Accumulated OCI, net of taxes	(9)	(9)		(9)
OCI before reclassifications
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $1 and $- for Con Edison and CECONY, respectively
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAXES			(2)		(2)
Accumulated OCI, net of taxes	$ (9)	$ (9)		$ (9)

Regulatory Matters - Other Regulatory Matters - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended			6 Months Ended
	Jun. 30, 2013	May 31, 2013	Jan. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Schedule Of Regulatory Assets And Liabilities [Line Items]
Revenue from electric				$ 249
Revenue from gas				32
Revenue from steam service				6
Potential refund to customers				1,246
Overcharges of construction expenditures				208
Refund amount	16			16
Regulatory asset	9,360			9,360	9,779
Minimum [Member]
Schedule Of Regulatory Assets And Liabilities [Line Items]
Refund amount	16			16
Maximum [Member]
Schedule Of Regulatory Assets And Liabilities [Line Items]
Overcharges of construction expenditures				208
Storm Damage [Member]
Schedule Of Regulatory Assets And Liabilities [Line Items]
Number of customers interrupted electric distribution service				1,400,000
Rockland Electric Company [Member] \| Storm costs [Member]
Schedule Of Regulatory Assets And Liabilities [Line Items]
Regulatory asset	29			29
Capital expenditures				6
CECONY [Member]
Schedule Of Regulatory Assets And Liabilities [Line Items]
Electric rate increase	425		375
Gas rate increase	26		25
Steam rate decrease		28	5
Return on common equity	10.10%	8.70%	10.35%
Common equity ratio	50.00%	48.00%	50.00%
Electric rate decreases		187
Gas rate decreases		122
Steam rate increase	11
Response and restoration costs				457
Capital expenditure				141
Regulatory asset	8,646			8,646	9,032
O&R [Member]
Schedule Of Regulatory Assets And Liabilities [Line Items]
Response and restoration costs				93
Capital expenditure				$ 15

Regulatory Matters - Regulatory Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Regulatory Assets [Line Items]
Regulatory assets - long-term	$ 9,304	$ 9,705
Regulatory assets - current	56	74
Regulatory liabilities - long-term	1,393	1,202
Total Regulatory Assets	9,360	9,779
Regulatory liabilities - current	88	183
Total Regulatory Liabilities	1,481	1,385
Unrecognized pension and other postretirement costs [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	5,227	5,677
Future income tax [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	1,996	1,922
Environmental remediation costs [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	713	730
Deferred storm costs [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	454	432
Pension and other postretirement benefits deferrals [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	201	183
Revenue taxes [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	183	176
Net electric deferrals [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	92	102
Unamortized loss on reacquired debt [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	69	74
Surcharge for New York State assessment [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	55	73
Deferred derivative losses - long-term [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	41	40
O&R transition bond charges [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	36	39
Preferred stock redemption [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	29	29
Workers' compensation [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	18	19
Property tax reconciliation [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	18	16
Regulatory liabilities - long-term	273	187
Other [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	172	193
Deferred derivative losses - current [Member]
Regulatory Assets [Line Items]
Regulatory assets - current	55	69
Recoverable energy costs - current [Member]
Regulatory Assets [Line Items]
Regulatory assets - current	1	5
Allowance for cost removal less salvage [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	518	503
Net unbilled revenue deferrals [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	137	136
Long-term interest rate reconciliation [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	83	62
World Trade Center settlement proceeds [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	62	62
Carrying charges on transmission and distribution net plant [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	26	31
Expenditure prudence proceeding [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	16	14
Other [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	278	207
Refundable energy costs - current [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - current	63	82
Revenue decoupling mechanism [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - current	23	72
Deferred derivative gains - current [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - current	2
Electric surcharge offset [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - current		29
CECONY [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	8,595	8,972
Regulatory assets - current	51	60
Regulatory liabilities - long-term	1,269	1,077
Total Regulatory Assets	8,646	9,032
Regulatory liabilities - current	54	145
Total Regulatory Liabilities	1,323	1,222
CECONY [Member] \| Unrecognized pension and other postretirement costs [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	4,985	5,407
CECONY [Member] \| Future income tax [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	1,889	1,831
CECONY [Member] \| Environmental remediation costs [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	599	615
CECONY [Member] \| Deferred storm costs [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	336	309
CECONY [Member] \| Pension and other postretirement benefits deferrals [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	170	154
CECONY [Member] \| Revenue taxes [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	176	170
CECONY [Member] \| Net electric deferrals [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	92	102
CECONY [Member] \| Unamortized loss on reacquired debt [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	66	70
CECONY [Member] \| Surcharge for New York State assessment [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	53	68
CECONY [Member] \| Deferred derivative losses - long-term [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	20	20
CECONY [Member] \| Preferred stock redemption [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	29	29
CECONY [Member] \| Workers' compensation [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	18	19
CECONY [Member] \| Property tax reconciliation [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	273	187
CECONY [Member] \| Other [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	162	178
CECONY [Member] \| Deferred derivative losses - current [Member]
Regulatory Assets [Line Items]
Regulatory assets - current	51	60
CECONY [Member] \| Recoverable energy costs - current [Member]
Regulatory Assets [Line Items]
Regulatory assets - current
CECONY [Member] \| Allowance for cost removal less salvage [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	433	420
CECONY [Member] \| Net unbilled revenue deferrals [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	137	136
CECONY [Member] \| Long-term interest rate reconciliation [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	83	62
CECONY [Member] \| World Trade Center settlement proceeds [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	62	62
CECONY [Member] \| Carrying charges on transmission and distribution net plant [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	14	13
CECONY [Member] \| Expenditure prudence proceeding [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	16	14
CECONY [Member] \| Other [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	251	183
CECONY [Member] \| Refundable energy costs - current [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - current	32	48
CECONY [Member] \| Revenue decoupling mechanism [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - current	21	68
CECONY [Member] \| Deferred derivative gains - current [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - current	1
CECONY [Member] \| Electric surcharge offset [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - current		$ 29

Capitalization - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended					1 Months Ended				6 Months Ended
	Apr. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Level 2 [Member]	Jun. 30, 2013 Level 3 [Member]	Jun. 30, 2013 CECONY [Member]	Feb. 28, 2013 CECONY [Member]	Dec. 31, 2012 CECONY [Member]	Jun. 30, 2013 CECONY [Member] Level 2 [Member]	Jun. 30, 2013 CECONY [Member] Level 3 [Member]
Schedule of Capitalization [Line Items]
Debentures issued							$ 700
Debentures interest rate	4.78%						3.95%
Period of debentures							30 years
Redeemable debentures						200	500
Redeemable debentures interest rate						3.85%	4.875%
Period of redeemable debentures						10 years	10 years
Senior notes issued	219
Senior notes weighted average life	15 years
Senior notes maturity date	2037
Long-term debt, fair value		12,313	12,935	11,677	636	10,991		11,751	10,355	636
Tax - exempt debt										$ 636

Capitalization - Carrying Amounts and Fair Values of Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Carrying Amount	$ 10,977	$ 10,768
Fair Value	12,313	12,935
CECONY [Member]
Carrying Amount	9,840	9,845
Fair Value	$ 10,991	$ 11,751

Short-Term Borrowing - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Short-term Debt [Line Items]
Commercial paper, outstanding	$ 1,400	$ 539
Weighted average interest rate	0.30%	0.30%
Loans outstanding under the credit agreement
Letters of credit outstanding under the credit agreement	34	131
CECONY [Member]
Short-term Debt [Line Items]
Commercial paper, outstanding	1,230	421
Weighted average interest rate	0.30%	0.30%
Letters of credit outstanding under the credit agreement	$ 11	$ 121

Pension Benefits - Companies' Net Periodic Benefit Costs (Detail) (Pension benefits [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Service cost - including administrative expenses	$ 67	$ 59	$ 133	$ 118
Interest cost on projected benefit obligation	134	137	268	274
Expected return on plan assets	(187)	(177)	(375)	(352)
Recognition of net actuarial loss	208	177	416	354
Recognition of prior service costs	1	2	3	4
NET PERIODIC BENEFIT COST	223	198	445	398
Amortization of regulatory asset	1	1	1	1
TOTAL PERIODIC BENEFIT COST	224	199	446	399
Cost capitalized	(88)	(68)	(170)	(135)
Reconciliation to rate level	(30)	3	(24)	(32)
Cost charged to operating expenses	106	134	252	232
CECONY [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - including administrative expenses	62	55	124	110
Interest cost on projected benefit obligation	126	128	252	257
Expected return on plan assets	(178)	(168)	(356)	(335)
Recognition of net actuarial loss	197	168	394	335
Recognition of prior service costs	1	2	2	3
NET PERIODIC BENEFIT COST	208	185	416	370
Amortization of regulatory asset	1	1	1	1
TOTAL PERIODIC BENEFIT COST	209	186	417	371
Cost capitalized	(84)	(63)	(163)	(126)
Reconciliation to rate level	(29)	2	(23)	(36)
Cost charged to operating expenses	$ 96	$ 125	$ 231	$ 209

Pension Benefits - Additional Information (Detail) (Pension benefits [Member], USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions	$ 867
Funds made to non-qualified supplemental plan	11
CECONY [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions	810
Estimated employer contributions to the plan	$ 350

Other Postretirement Benefits - Net Periodic Postretirement Benefit Costs (Detail) (Other Postretirement Benefits [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Schedule Of Other Postretirement Benefits [Line Items]
Service cost	$ 6	$ 6	$ 12	$ 13
Interest cost on accumulated other postretirement benefit obligation	13	18	27	36
Expected return on plan assets	(19)	(21)	(39)	(42)
Recognition of net actuarial loss	16	24	32	49
Recognition of prior service cost	(7)	(5)	(13)	(11)
Recognition of transition obligation		1		1
NET PERIODIC BENEFIT COST	9	23	19	46
Cost capitalized	(4)	(8)	(7)	(16)
Reconciliation to rate level	16	5	29	14
Cost charged to operating expenses	21	20	41	44
CECONY [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Service cost	5	5	9	10
Interest cost on accumulated other postretirement benefit obligation	12	15	23	32
Expected return on plan assets	(17)	(18)	(34)	(38)
Recognition of net actuarial loss	14	21	28	44
Recognition of prior service cost	(6)	(4)	(11)	(9)
Recognition of transition obligation		1		1
NET PERIODIC BENEFIT COST	8	20	15	40
Cost capitalized	(4)	(7)	(6)	(14)
Reconciliation to rate level	13	4	25	8
Cost charged to operating expenses	$ 17	$ 17	$ 34	$ 34

Other Postretirement Benefits - Additional Information (Detail) (Other Postretirement Benefits [Member], USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Schedule Of Other Postretirement Benefits [Line Items]
Expected contributions	$ 10
CECONY [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Expected contributions	$ 10

Environmental Matters - Accrued Liabilities and Regulatory Assets (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Accrued Liabilities:
Regulatory assets	$ 9,360	$ 9,779
Manufactured gas plant sites [Member]
Accrued Liabilities:
Accrued Liabilities	447	462
Other Superfund Sites [Member]
Accrued Liabilities:
Accrued Liabilities	75	83
Superfund Sites [Member]
Accrued Liabilities:
Accrued Liabilities	522	545
Regulatory assets	713	730
CECONY [Member]
Accrued Liabilities:
Regulatory assets	8,646	9,032
CECONY [Member] \| Manufactured gas plant sites [Member]
Accrued Liabilities:
Accrued Liabilities	339	351
CECONY [Member] \| Other Superfund Sites [Member]
Accrued Liabilities:
Accrued Liabilities	74	82
CECONY [Member] \| Superfund Sites [Member]
Accrued Liabilities:
Accrued Liabilities	413	433
Regulatory assets	$ 599	$ 615

Environmental Matters - Environmental Remediation Costs (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accrued Environmental Remediation Costs [Line Items]
Remediation costs incurred	$ 14	$ 8	$ 24	$ 15
Insurance recoveries received
CECONY [Member]
Accrued Environmental Remediation Costs [Line Items]
Remediation costs incurred	13	7	20	14
Insurance recoveries received

Environmental Matters - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2010
CECONY [Member] \| Asbestos Proceedings [Member]
Accrued Environmental Remediation Costs [Line Items]
Estimated undiscounted asbestos liability	$ 10
Estimated undiscounted asbestos liability in year	15 years
CECONY [Member] \| Superfund Sites [Member] \| Manufactured gas plant sites [Member]
Accrued Environmental Remediation Costs [Line Items]
Estimated aggregate undiscounted potential liability related environmental contaminants	1,900.0
O&R [Member] \| Superfund Sites [Member] \| Manufactured gas plant sites [Member]
Accrued Environmental Remediation Costs [Line Items]
Estimated aggregate undiscounted potential liability related environmental contaminants	$ 200.0

Environmental Matters - Accrued Liability for Asbestos Suits and Workers' Compensation Proceedings (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Site Contingency [Line Items]
Regulatory assets	$ 9,360	$ 9,779
Asbestos suits [Member]
Site Contingency [Line Items]
Accrued liability	10	10
Regulatory assets	10	10
Workers' compensation [Member]
Site Contingency [Line Items]
Accrued liability	93	94
Regulatory assets	18	19
CECONY [Member]
Site Contingency [Line Items]
Regulatory assets	8,646	9,032
CECONY [Member] \| Asbestos suits [Member]
Site Contingency [Line Items]
Accrued liability	10	10
Regulatory assets	10	10
CECONY [Member] \| Workers' compensation [Member]
Site Contingency [Line Items]
Accrued liability	88	89
Regulatory assets	$ 18	$ 19

Other Material Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2013 Lawsuits	Jan. 31, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2013 Tax deficiency paid in December 2005 [Member]	Jun. 30, 2013 Interest in April 2006 [Member]	Jun. 30, 2013 Leases [Member]	Jun. 30, 2013 Energy [Member]	Jun. 30, 2013 Construction [Member]	Jun. 30, 2013 IRS [Member]
Operating Leased Assets [Line Items]
Number of suits pending against the company	93
Total investment in electric generating and gas distribution facilities	$ 259
Transactions financed with equity	93
Transactions financed with non-recourse	166
Tax deficiency paid to IRS					0.3
Interest paid related to tax deficiency						0.2
Disallowed deduction					574
Estimated charge after-tax			150
Gain from LILO transaction termination	29
Proceeds from the termination of a LILO transaction	108
The company's net investment in LILO transaction	43			(76)
Gross investment in LILO transaction	47			228
Deferred tax liabilities	4			304
Defray of interest charges relating to potential tax liability		447
Returned deposit from IRS	405			70						95
Guarantee obligations maximum exposure	883			859
Guarantees issued							2	25	4
Maximum potential obligation	$ 5

Other Material Contingencies - Schedule of Leveraged Lease Transactions Effect on Consolidated Income Statement (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Leveraged Lease [Line Items]
Total increase/(decrease) in net income	$ 29	$ (121)
Increase/(decrease) to non-utility operating revenues [Member]
Leveraged Lease [Line Items]
Total increase/(decrease) in net income	51	(70)
(Increase)/decrease to other interest expense [Member]
Leveraged Lease [Line Items]
Total increase/(decrease) in net income		(131)
Income tax benefit/(expense) [Member]
Leveraged Lease [Line Items]
Total increase/(decrease) in net income	$ (22)	$ 80

Other Material Contingencies - Total Guarantees (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Guarantor Obligations [Line Items]
Total guarantees, by type and term	$ 883	$ 859
Energy transactions [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	836
Intra-company guarantees [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	16
Other guarantees [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	31
0 - 3 years [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	824
0 - 3 years [Member] \| Energy transactions [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	777
0 - 3 years [Member] \| Intra-company guarantees [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	16
0 - 3 years [Member] \| Other guarantees [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	31
4 - 10 years [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	31
4 - 10 years [Member] \| Energy transactions [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	31
4 - 10 years [Member] \| Intra-company guarantees [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term
4 - 10 years [Member] \| Other guarantees [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term
Greater than 10 years [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	28
Greater than 10 years [Member] \| Energy transactions [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	28
Greater than 10 years [Member] \| Intra-company guarantees [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term
Greater than 10 years [Member] \| Other guarantees [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term

Income Tax - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Operating Loss Carryforwards [Line Items]
INCOME TAX EXPENSE	$ 65		$ 106	$ 122	$ 240
Effective tax rate	27.00%		33.00%	25.00%	33.00%
Estimated federal and state uncertain tax positions	3	72		3
Decrease in estimated prior year liabilities	238
Liabilities for uncertain tax positions	16			16
Interest charges related to uncertain tax positions		126
Interest charges related to uncertain tax position, LILO transaction		131
Liabilities for uncertain tax positions	13			13		44
Unrecognized tax benefits amount	6			6
Federal and State [Member]
Operating Loss Carryforwards [Line Items]
Estimated federal and state uncertain tax positions		238
CECONY [Member]
Operating Loss Carryforwards [Line Items]
INCOME TAX EXPENSE	57		75	209	209
Effective tax rate	27.00%		32.00%	33.00%	32.00%
Estimated federal and state uncertain tax positions		66
Liabilities for uncertain tax positions	7			7
Reduced interest expenses		5
Liabilities for uncertain tax positions	$ 7			$ 7		$ 36

Financial Information by Business Segment - Financial Data for Business Segments (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Operating revenues	$ 2,818	$ 2,771	$ 6,003	$ 5,849
Inter-segment revenues
Depreciation and amortization	255	236	506	469
Operating income	386	475	912	1,036
Competitive energy businesses [Member]
Segment Reporting Information [Line Items]
Operating revenues	317	300	469	610
Inter-segment revenues	2	2	4	4
Depreciation and amortization	5	2	10	4
Operating income	27	78	(56)	59
Other [Member]
Segment Reporting Information [Line Items]
Operating revenues	(1)	(2)	(1)	(5)
Inter-segment revenues	(2)	(2)	(4)	(4)
Depreciation and amortization	1
Operating income			1	(3)
CECONY [Member]
Segment Reporting Information [Line Items]
Operating revenues	2,321	2,309	5,127	4,870
Inter-segment revenues
Depreciation and amortization	235	221	468	439
Operating income	346	380	906	925
CECONY [Member] \| Operating Segments [Member] \| CECONY - Electric [Member]
Segment Reporting Information [Line Items]
Operating revenues	1,872	1,961	3,686	3,696
Inter-segment revenues	4	4	8	7
Depreciation and amortization	186	175	371	348
Operating income	307	348	495	573
CECONY [Member] \| Operating Segments [Member] \| CECONY - Gas [Member]
Segment Reporting Information [Line Items]
Operating revenues	331	265	991	828
Inter-segment revenues	2	2	3	3
Depreciation and amortization	32	30	64	59
Operating income	53	54	296	275
CECONY [Member] \| Operating Segments [Member] \| CECONY - Steam [Member]
Segment Reporting Information [Line Items]
Operating revenues	118	83	450	346
Inter-segment revenues	19	19	38	38
Depreciation and amortization	17	16	33	32
Operating income	(14)	(22)	115	77
CECONY [Member] \| Consolidation adjustments [Member]
Segment Reporting Information [Line Items]
Operating revenues
Inter-segment revenues	(25)	(25)	(49)	(48)
Depreciation and amortization
Operating income
O&R [Member]
Segment Reporting Information [Line Items]
Operating revenues	181	164	408	374
Inter-segment revenues
Depreciation and amortization	14	13	28	26
Operating income	13	17	61	55
O&R [Member] \| Operating Segments [Member] \| CECONY - Electric [Member]
Segment Reporting Information [Line Items]
Operating revenues	146	129	291	257
Inter-segment revenues
Depreciation and amortization	10	9	20	19
Operating income	14	16	34	24
O&R [Member] \| Operating Segments [Member] \| CECONY - Gas [Member]
Segment Reporting Information [Line Items]
Operating revenues	35	35	117	117
Inter-segment revenues
Depreciation and amortization	4	4	8	7
Operating income	$ (1)	$ 1	$ 27	$ 31

Derivative Instruments and Hedging Activities - Fair Values of Commodity Derivatives Including Offsetting of Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/(Liabilities)	$ (68)	$ (90)
Gross Amounts Offset in the Statement of Financial Position	38	47
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	(30)	(43)
Net Amount	(30)	(43)
Derivative assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/(Liabilities)	78	86
Gross Amounts Offset in the Statement of Financial Position	(49)	(57)
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	29	29
Net Amount	29	29
Derivative liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/(Liabilities)	(146)	(176)
Gross Amounts Offset in the Statement of Financial Position	87	104
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	(59)	(72)
Net Amount	(59)	(72)
CECONY [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/(Liabilities)	(49)	(56)
Gross Amounts Offset in the Statement of Financial Position	24	29
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	(25)	(27)
Net Amount	(25)	(27)
CECONY [Member] \| Derivative assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/(Liabilities)	22	27
Gross Amounts Offset in the Statement of Financial Position	(13)	(15)
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	9	12
Net Amount	9	12
CECONY [Member] \| Derivative liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/(Liabilities)	(71)	(83)
Gross Amounts Offset in the Statement of Financial Position	37	44
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	(34)	(39)
Net Amount	(34)	(39)
Financial instruments [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Financial instruments [Member] \| Derivative assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Financial instruments [Member] \| Derivative liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Financial instruments [Member] \| CECONY [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Financial instruments [Member] \| CECONY [Member] \| Derivative assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Financial instruments [Member] \| CECONY [Member] \| Derivative liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Cash collateral received [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Cash collateral received [Member] \| Derivative assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Cash collateral received [Member] \| Derivative liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Cash collateral received [Member] \| CECONY [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Cash collateral received [Member] \| CECONY [Member] \| Derivative assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
Cash collateral received [Member] \| CECONY [Member] \| Derivative liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position

Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Investment Holdings [Line Items]
Energy supply and hedging activities credit exposure total	$ 146	$ 146
Makeup of net credit exposure, with investment-grade counterparties	38	38
Makeup of net credit exposure with commodity exchange brokers	37	37
Makeup of net credit exposure independent system operators		69
Makeup of net credit exposure non-investment grade/non-rated counterparties		2
Number of Capacity Contracts		1,188
Interest Rate Swap [Member]
Investment Holdings [Line Items]
Derivative, fixed interest rate	6.09%	6.09%
Unrealized gain (loss) on derivatives		(4)
Increase in the fair value of derivative	1	2
CECONY [Member]
Investment Holdings [Line Items]
Energy supply and hedging activities credit exposure total	$ 15	$ 15
Number of Capacity Contracts		620

Derivative Instruments and Hedging Activities - Fair Values of Companies' Commodity Derivatives (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Derivatives assets [Member]
Derivatives Assets
Fair value of derivative assets	$ 78	$ 86
Impact of netting	(18)	(20)
Net derivatives assets	60	66
Derivatives assets [Member] \| Other current assets [Member]
Derivatives Assets
Fair value of derivative assets	56	64
Derivatives assets [Member] \| Other deferred charges and noncurrent assets [Member]
Derivatives Assets
Fair value of derivative assets	22	22
Derivatives liabilities [Member]
Derivatives Liabilities
Fair value of derivative liabilities	146	176
Impact of netting	(87)	(104)
Net derivatives liabilities	59	72
Derivatives liabilities [Member] \| Fair value of derivative liabilities, Current [Member]
Derivatives Liabilities
Fair value of derivative liabilities	91	122
Derivatives liabilities [Member] \| Fair value of derivative liabilities, Long-term [Member]
Derivatives Liabilities
Fair value of derivative liabilities	55	54
CECONY [Member] \| Derivatives assets [Member]
Derivatives Assets
Fair value of derivative assets	22	27
Impact of netting	2	3
Net derivatives assets	24	30
CECONY [Member] \| Derivatives assets [Member] \| Other current assets [Member]
Derivatives Assets
Fair value of derivative assets	15	18
CECONY [Member] \| Derivatives assets [Member] \| Other deferred charges and noncurrent assets [Member]
Derivatives Assets
Fair value of derivative assets	7	9
CECONY [Member] \| Derivatives liabilities [Member]
Derivatives Liabilities
Fair value of derivative liabilities	71	83
Impact of netting	(37)	(44)
Net derivatives liabilities	34	39
CECONY [Member] \| Derivatives liabilities [Member] \| Fair value of derivative liabilities, Current [Member]
Derivatives Liabilities
Fair value of derivative liabilities	48	58
CECONY [Member] \| Derivatives liabilities [Member] \| Fair value of derivative liabilities, Long-term [Member]
Derivatives Liabilities
Fair value of derivative liabilities	$ 23	$ 25

Derivative Instruments and Hedging Activities - Changes in Fair Values of Commodity Derivatives (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	$ (9)	$ (1)	$ 2
Total deferred gains/(losses)	(48)	11	8	(100)
Net deferred gains/(losses)	(57)	10	10	(100)
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income	(42)	18	20	(72)
Deferred derivative gains, Current [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(7)	(1)	2
Regulatory liabilities, Long-term [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(2)
Deferred derivative losses, Current [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(24)	66	14	38
Recoverable energy costs, Current [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(14)	(63)	(3)	(127)
Regulatory assets, Long-term [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(10)	8	(3)	(11)
Non-utility revenue [Member]
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income	2	(8)	1	(11)
Purchased power expense [Member]
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income	(37)	27	30	(59)
Gas purchased for resale [Member]
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income	(7)	(1)	(11)	(2)
CECONY [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(8)	(1)	1
Total deferred gains/(losses)	(41)	15	7	(77)
Net deferred gains/(losses)	(49)	14	8	(77)
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income
CECONY [Member] \| Deferred derivative gains, Current [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(7)	(1)	1
CECONY [Member] \| Regulatory liabilities, Long-term [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(1)
CECONY [Member] \| Deferred derivative losses, Current [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(23)	55	9	36
CECONY [Member] \| Recoverable energy costs, Current [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(12)	(56)	(2)	(112)
CECONY [Member] \| Regulatory assets, Long-term [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(6)	16		(1)
CECONY [Member] \| Non-utility revenue [Member]
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income
CECONY [Member] \| Purchased power expense [Member]
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income
CECONY [Member] \| Gas purchased for resale [Member]
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income

Derivative Instruments and Hedging Activities - Changes in Fair Values of Commodity Derivatives (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Non-utility revenue [Member]
Derivatives, Fair Value [Line Items]
Unrealized gain/(loss) on derivatives	$ (1)	$ (9)		$ (13)
Purchased power expense [Member]
Derivatives, Fair Value [Line Items]
Unrealized gain/(loss) on derivatives	$ (29)	$ 72	$ 16	$ 45

Derivative Instruments and Hedging Activities - Number of Derivative Contracts by Commodity Type (Detail)	6 Months Ended
	Jun. 30, 2013 Contract
Derivatives, Fair Value [Line Items]
Number of Capacity Contracts	1,188
CECONY [Member]
Derivatives, Fair Value [Line Items]
Number of Capacity Contracts	620
Electric Derivatives [Member]
Derivatives, Fair Value [Line Items]
Number of Energy Contracts	498
MWHs	15,234,227
Number of Capacity Contracts	72
MWs	11,712
Electric Derivatives [Member] \| CECONY [Member]
Derivatives, Fair Value [Line Items]
Number of Energy Contracts	91
MWHs	3,674,400
Number of Capacity Contracts
MWs
Gas Derivatives [Member]
Derivatives, Fair Value [Line Items]
Number of Energy Contracts	618
Dths	81,575,092
Number of Capacity Contracts	1,188
Gas Derivatives [Member] \| CECONY [Member]
Derivatives, Fair Value [Line Items]
Number of Energy Contracts	529
Dths	76,570,000
Number of Capacity Contracts	620

Derivative Instruments and Hedging Activities - Aggregate Fair Value of All Derivative Instruments with Credit-Risk-Related Contingent Features (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Derivatives, Fair Value [Line Items]
Aggregate fair value - net liabilities	$ 39
Collateral posted
Additional Collateral Required Due To Loss Of Unsecured Credit [Member]
Derivatives, Fair Value [Line Items]
Collateral posted	15
Additional collateral
Additional collateral aggregate fair value down below investment grade [Member]
Derivatives, Fair Value [Line Items]
Collateral posted	58
Additional collateral	50
CECONY [Member]
Derivatives, Fair Value [Line Items]
Aggregate fair value - net liabilities	33
Collateral posted
CECONY [Member] \| Additional Collateral Required Due To Loss Of Unsecured Credit [Member]
Derivatives, Fair Value [Line Items]
Collateral posted	0
Additional collateral
CECONY [Member] \| Additional collateral aggregate fair value down below investment grade [Member]
Derivatives, Fair Value [Line Items]
Collateral posted	0
Additional collateral	$ 37

Derivative Instruments and Hedging Activities - Aggregate Fair Value of All Derivative Instruments with Credit-Risk-Related Contingent Features (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Derivatives, Fair Value [Line Items]
Collateral posted
Additional Collateral Required Due To Loss Of Unsecured Credit [Member]
Derivatives, Fair Value [Line Items]
Collateral posted	15
Additional collateral aggregate fair value down below investment grade [Member]
Derivatives, Fair Value [Line Items]
Collateral posted	58
CECONY [Member]
Derivatives, Fair Value [Line Items]
Collateral posted
CECONY [Member] \| Additional Collateral Required Due To Loss Of Unsecured Credit [Member]
Derivatives, Fair Value [Line Items]
Collateral posted	0
CECONY [Member] \| Additional collateral aggregate fair value down below investment grade [Member]
Derivatives, Fair Value [Line Items]
Collateral posted	$ 0

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended	3 Months Ended
	Dec. 31, 2012	Mar. 31, 2012 Interest rate contract [Member]	Mar. 31, 2012 Con Edison [Member] Other assets [Member]	Mar. 31, 2012 CECONY [Member] Other assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement assets, transfers from Level 3 to Level 2			$ 105	$ 95
Fair value measurement liabilities, transfers from Level 1 to Level 2	2
Fair value measurement liabilities, transfers from Level 2 to Level 1	9
Fair value measurement liabilities, transfers from Level 2 to Level 3	2
Fair value measurement liabilities, transfers from Level 3 to Level 2	$ 11	$ 8

Fair Value Measurements - Schedule of Commodity Derivatives (Detail) (USD $)	6 Months Ended
	Jun. 30, 2013
Electricity [Member]
Financial Instruments [Line Items]
Valuation Techniques	Discounted Cash Flow
Standard Offer Capacity Agreements [Member]
Financial Instruments [Line Items]
Valuation Techniques	Discounted Cash Flow
Transmission Congestion Contracts / Financial Transmission Rights [Member]
Financial Instruments [Line Items]
Valuation Techniques	Discounted Cash Flow
Minimum [Member] \| Present value factor [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range in Percentage	2.49%
Minimum [Member] \| Discount to adjust auction prices for inter-zonal forward price curves [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range in Percentage	17.50%
Minimum [Member] \| Discount to adjust auction prices for historical monthly realized settlements [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range in Percentage	8.50%
Minimum [Member] \| Inter-zonal forward price curves and for historical zonal losses [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range	$ 0.54
Minimum [Member] \| Forward energy prices [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range	20
Minimum [Member] \| Forward capacity prices [Member] \| Standard Offer Capacity Agreements [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range	119
Maximum [Member] \| Discount to adjust auction prices for inter-zonal forward price curves [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range in Percentage	42.40%
Maximum [Member] \| Discount to adjust auction prices for historical monthly realized settlements [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range in Percentage	49.00%
Maximum [Member] \| Inter-zonal forward price curves and for historical zonal losses [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range	12.68
Maximum [Member] \| Forward energy prices [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range	129
Maximum [Member] \| Forward capacity prices [Member] \| Standard Offer Capacity Agreements [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range	248
Level 3 [Member]
Financial Instruments [Line Items]
Fair Value of commodity derivatives	(6,000,000)
Level 3 [Member] \| Electricity [Member]
Financial Instruments [Line Items]
Fair Value of commodity derivatives	(2,000,000)
Level 3 [Member] \| Standard Offer Capacity Agreements [Member]
Financial Instruments [Line Items]
Fair Value of commodity derivatives	(15,000,000)
Level 3 [Member] \| Transmission Congestion Contracts / Financial Transmission Rights [Member]
Financial Instruments [Line Items]
Fair Value of commodity derivatives	11,000,000
CECONY [Member] \| Transmission Congestion Contracts [Member]
Financial Instruments [Line Items]
Valuation Techniques	Discounted Cash Flow
CECONY [Member] \| Minimum [Member] \| Discount to adjust auction prices for inter-zonal forward price curves [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range in Percentage	17.50%
CECONY [Member] \| Minimum [Member] \| Discount to adjust auction prices for historical monthly realized settlements [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range in Percentage	8.50%
CECONY [Member] \| Maximum [Member] \| Discount to adjust auction prices for inter-zonal forward price curves [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range in Percentage	42.40%
CECONY [Member] \| Maximum [Member] \| Discount to adjust auction prices for historical monthly realized settlements [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range in Percentage	49.00%
CECONY [Member] \| Level 3 [Member] \| Transmission Congestion Contracts [Member]
Financial Instruments [Line Items]
Fair Value of commodity derivatives	$ 8,000,000

Fair Value Measurements - Reconciliation of Beginning and Ending Net Balances for Assets and Liabilities Measured at Level 3 Fair Value (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance				$ 29
Included in Earnings				(80)
Included in Regulatory Assets and Liabilities				(10)
Purchases				11
Issuances
Sales
Settlements				82
Transfer In/Out of Level 3				(93)
Ending Balance		(61)		(61)
Commodity [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	14	(93)	(5)	(62)
Included in Earnings	(21)	(24)	8	(82)
Included in Regulatory Assets and Liabilities	(2)	4	3	(13)
Purchases	2	5	7	11
Issuances
Sales
Settlements	1	43	(19)	81
Transfer In/Out of Level 3		4		4
Ending Balance	(6)	(61)	(6)	(61)
Interest rate contract [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance				(8)
Included in Earnings				(1)
Issuances
Sales
Settlements				1
Transfer In/Out of Level 3				8
Other assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance				99
Included in Earnings				3
Included in Regulatory Assets and Liabilities				3
Issuances
Sales
Transfer In/Out of Level 3				(105)
CECONY [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance				83
Included in Earnings				(13)
Included in Regulatory Assets and Liabilities				(1)
Purchases				8
Issuances
Sales
Settlements				6
Transfer In/Out of Level 3				(93)
Ending Balance		(10)		(10)
CECONY [Member] \| Commodity [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	11	(13)	10	(7)
Included in Earnings	(2)	(11)	7	(16)
Included in Regulatory Assets and Liabilities		4	1	(3)
Purchases	1	2	5	8
Issuances
Sales
Settlements	(2)	6	(15)	6
Transfer In/Out of Level 3		2		2
Ending Balance	8	(10)	8	(10)
CECONY [Member] \| Other assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance				90
Included in Earnings				3
Included in Regulatory Assets and Liabilities				2
Issuances
Sales
Transfer In/Out of Level 3				$ (95)

Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gain (loss) on Level 3 energy derivative assets				$ 80
Other Income [Member] \| Competitive energy businesses [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gain (loss) on Level 3 energy derivative assets	(2)		(2)
Gain (loss) on Level 3 energy derivative liabilities		(6)		(9)
Fair value, assets measured on recurring basis, change in unrealized gain (loss)	(2)	(6)	(2)	(9)
Purchased power expense [Member] \| Competitive energy businesses [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gain (loss) on Level 3 energy derivative assets	(15)		4
Gain (loss) on Level 3 energy derivative liabilities		(1)		(44)
Fair value, assets measured on recurring basis, change in unrealized gain (loss)	$ (14)	$ 31	$ 2	$ 24

Asset Retirement Obligations - Accrued Liability for Asset Retirement Obligations and Regulatory Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Regulatory Liabilities [Line Items]
Accrued liability - asset retirement obligations	$ 162	$ 159
Regulatory liabilities - allowance for cost of removal less salvage	1,393	1,202
Allowance for cost removal less salvage [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities - allowance for cost of removal less salvage	518	503
CECONY [Member]
Regulatory Liabilities [Line Items]
Accrued liability - asset retirement obligations	162	158
Regulatory liabilities - allowance for cost of removal less salvage	1,269	1,077
CECONY [Member] \| Allowance for cost removal less salvage [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities - allowance for cost of removal less salvage	$ 433	$ 420

Derivative Instruments and Hedging Activities - Fair Values of Commodity Derivatives Including Offsetting of Assets and Liabilities (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Margin deposits	$ 31	$ 37
CECONY [Member]
Derivatives, Fair Value [Line Items]
Margin deposits	$ 15	$ 18

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Con Edison [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	$ 298	$ 279
Total liabilities	63	78
CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	246	227
Total liabilities	34	39
Commodity [Member] \| Con Edison [Member] \| Derivatives assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	60	66
Commodity [Member] \| Con Edison [Member] \| Derivatives liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	59	72
Commodity [Member] \| CECONY [Member] \| Derivatives assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	24	30
Commodity [Member] \| CECONY [Member] \| Derivatives liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	34	39
Other assets [Member] \| Con Edison [Member] \| Derivatives assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	238	213
Other assets [Member] \| CECONY [Member] \| Derivatives assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	222	197
Interest rate contract [Member] \| Con Edison [Member] \| Derivatives liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	4	6
Interest rate contract [Member] \| CECONY [Member] \| Derivatives liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities
Level 1 [Member] \| Con Edison [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	128	106
Total liabilities	13	12
Level 1 [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	121	99
Total liabilities	13	12
Level 1 [Member] \| Commodity [Member] \| Con Edison [Member] \| Derivatives assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets
Level 1 [Member] \| Commodity [Member] \| Con Edison [Member] \| Derivatives liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	13	12
Level 1 [Member] \| Commodity [Member] \| CECONY [Member] \| Derivatives assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets
Level 1 [Member] \| Commodity [Member] \| CECONY [Member] \| Derivatives liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	13	12
Level 1 [Member] \| Other assets [Member] \| Con Edison [Member] \| Derivatives assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	128	106
Level 1 [Member] \| Other assets [Member] \| CECONY [Member] \| Derivatives assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	121	99
Level 1 [Member] \| Interest rate contract [Member] \| Con Edison [Member] \| Derivatives liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities
Level 1 [Member] \| Interest rate contract [Member] \| CECONY [Member] \| Derivatives liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities
Level 2 [Member] \| Con Edison [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	164	150
Total liabilities	107	122
Level 2 [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	107	106
Total liabilities	50	62
Level 2 [Member] \| Commodity [Member] \| Con Edison [Member] \| Derivatives assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	54	43
Level 2 [Member] \| Commodity [Member] \| Con Edison [Member] \| Derivatives liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	103	116
Level 2 [Member] \| Commodity [Member] \| CECONY [Member] \| Derivatives assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	6	8
Level 2 [Member] \| Commodity [Member] \| CECONY [Member] \| Derivatives liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	50	62
Level 2 [Member] \| Other assets [Member] \| Con Edison [Member] \| Derivatives assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	110	107
Level 2 [Member] \| Other assets [Member] \| CECONY [Member] \| Derivatives assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	101	98
Level 2 [Member] \| Interest rate contract [Member] \| Con Edison [Member] \| Derivatives liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	4	6
Level 2 [Member] \| Interest rate contract [Member] \| CECONY [Member] \| Derivatives liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities
Level 3 [Member] \| Con Edison [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	13	33
Total liabilities	19	38
Level 3 [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	8	10
Total liabilities
Level 3 [Member] \| Commodity [Member] \| Con Edison [Member] \| Derivatives assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	13	33
Level 3 [Member] \| Commodity [Member] \| Con Edison [Member] \| Derivatives liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	19	38
Level 3 [Member] \| Commodity [Member] \| CECONY [Member] \| Derivatives assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	8	10
Level 3 [Member] \| Commodity [Member] \| CECONY [Member] \| Derivatives liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities
Level 3 [Member] \| Other assets [Member] \| Con Edison [Member] \| Derivatives assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets
Level 3 [Member] \| Other assets [Member] \| CECONY [Member] \| Derivatives assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets
Level 3 [Member] \| Interest rate contract [Member] \| Con Edison [Member] \| Derivatives liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities
Level 3 [Member] \| Interest rate contract [Member] \| CECONY [Member] \| Derivatives liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities
Netting Adjustments [Member] \| Con Edison [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	(7)	(10)
Total liabilities	(76)	(94)
Netting Adjustments [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	10	12
Total liabilities	(29)	(35)
Netting Adjustments [Member] \| Commodity [Member] \| Con Edison [Member] \| Derivatives assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	(7)	(10)
Netting Adjustments [Member] \| Commodity [Member] \| Con Edison [Member] \| Derivatives liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	(76)	(94)
Netting Adjustments [Member] \| Commodity [Member] \| CECONY [Member] \| Derivatives assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	10	12
Netting Adjustments [Member] \| Commodity [Member] \| CECONY [Member] \| Derivatives liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	(29)	(35)
Netting Adjustments [Member] \| Other assets [Member] \| Con Edison [Member] \| Derivatives assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets
Netting Adjustments [Member] \| Other assets [Member] \| CECONY [Member] \| Derivatives assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets
Netting Adjustments [Member] \| Interest rate contract [Member] \| Con Edison [Member] \| Derivatives liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities
Netting Adjustments [Member] \| Interest rate contract [Member] \| CECONY [Member] \| Derivatives liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities