Document and Entity Information	9 Months Ended
Document and Entity Information	Sep. 30, 2013	Oct. 30, 2013
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
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		292,888,192
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		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
OPERATING REVENUES
Electric	$ 2,822	$ 2,810	$ 6,799	$ 6,762
Gas	225	216	1,333	1,161
Steam	72	68	522	414
Non-utility	365	344	833	950
TOTAL OPERATING REVENUES	3,484	3,438	9,487	9,287
OPERATING EXPENSES
Purchased power	946	930	2,421	2,440
Fuel	56	59	261	213
Gas purchased for resale	74	56	443	314
Other operations and maintenance	795	826	2,400	2,365
Depreciation and amortization	258	240	764	709
Taxes, other than income taxes	500	476	1,431	1,360
TOTAL OPERATING EXPENSES	2,629	2,587	7,720	7,401
OPERATING INCOME	855	851	1,767	1,886
OTHER INCOME (DEDUCTIONS)
Investment and other income	8	4	19	14
Allowance for equity funds used during construction	1	1	2	3
Other deductions	(4)	(3)	(12)	(13)
TOTAL OTHER INCOME (DEDUCTIONS)	5	2	9	4
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	860	853	1,776	1,890
INTEREST EXPENSE
Interest on long-term debt	145	146	433	440
Other interest	2	6	143	17
Allowance for borrowed funds used during construction	(1)		(1)	(2)
NET INTEREST EXPENSE	146	152	575	455
INCOME BEFORE INCOME TAX EXPENSE	714	701	1,201	1,435
INCOME TAX EXPENSE	250	261	373	501
NET INCOME	464	440	828	934
Cumulative preferred dividends				(3)
NET INCOME FOR COMMON STOCK	464	440	828	931
Net income for common stock per common share-basic	$ 1.58	$ 1.50	$ 2.83	$ 3.18
Net income for common stock per common share-diluted	$ 1.58	$ 1.49	$ 2.81	$ 3.16
DIVIDENDS DECLARED PER SHARE OF COMMON STOCK	$ 0.615	$ 0.605	$ 1.845	$ 1.815
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	294.6	294.3	294.6
CECONY [Member]
OPERATING REVENUES
Electric	2,622	2,611	6,309	6,307
Gas	199	189	1,190	1,017
Steam	72	68	522	414
TOTAL OPERATING REVENUES	2,893	2,868	8,021	7,738
OPERATING EXPENSES
Purchased power	624	604	1,548	1,554
Fuel	56	59	261	213
Gas purchased for resale	58	45	376	264
Other operations and maintenance	686	725	2,102	2,065
Depreciation and amortization	237	225	705	664
Taxes, other than income taxes	480	456	1,370	1,300
TOTAL OPERATING EXPENSES	2,141	2,114	6,362	6,060
OPERATING INCOME	752	754	1,659	1,678
OTHER INCOME (DEDUCTIONS)
Investment and other income	1	2	7	6
Allowance for equity funds used during construction	1		1	2
Other deductions	(3)	(2)	(10)	(10)
TOTAL OTHER INCOME (DEDUCTIONS)	(1)		(2)	(2)
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	751	754	1,657	1,676
INTEREST EXPENSE
Interest on long-term debt	127	130	384	395
Other interest	1	8	12	19
Allowance for borrowed funds used during construction			(1)	(1)
NET INTEREST EXPENSE	128	138	395	413
INCOME BEFORE INCOME TAX EXPENSE	623	616	1,262	1,263
INCOME TAX EXPENSE	222	227	431	436
NET INCOME	401	389	831	827
Cumulative preferred dividends				(3)
NET INCOME FOR COMMON STOCK	$ 401	$ 389	$ 831	$ 824

Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
NET INCOME	$ 464	$ 440	$ 828	$ 934
OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAXES
Pension plan liability adjustments, net	2	2	7	8
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAXES	2	2	7	8
COMPREHENSIVE INCOME	466	442	835	942
Preferred stock dividend requirements of subsidiary				(3)
COMPREHENSIVE INCOME FOR COMMON STOCK	466	442	835	939
CECONY [Member]
NET INCOME	401	389	831	827
OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAXES
Pension plan liability adjustments, net				(2)
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAXES				(2)
COMPREHENSIVE INCOME	401	389	831	825
Preferred stock dividend requirements of subsidiary				$ (3)

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 20

-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Other Comprehensive Income

-URI http://asc.fasb.org/extlink&oid=6519514

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Net Income

-URI http://asc.fasb.org/extlink&oid=6518256

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.19)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.18)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.22)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 9: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e565-108580

Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 19

-Article 5

+ Details

Consolidated Statement of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
OPERATING ACTIVITIES
NET INCOME	$ 828	$ 934
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	764	709
Deferred income taxes	116	344
Rate case amortization and accruals	1	32
Common equity component of allowance for funds used during construction	(2)	(3)
Net derivative (gains)/losses	(6)	(61)
Pre-tax gains on the termination of LILO transactions	(95)
Other non-cash items (net)	46	(53)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable - customers, less allowance for uncollectibles	(51)	(196)
Special deposits	(305)
Materials and supplies, including fuel oil and gas in storage	(38)	1
Other receivables and other current assets	(8)	54
Prepayments	(362)	(288)
Accounts payable	(193)	18
Pensions and retiree benefits obligations	665	713
Pensions and retiree benefits contributions	(887)	(821)
Accrued taxes	217	(80)
Accrued interest	171	46
Superfund and environmental remediation costs (net)	(6)	7
Deferred charges, noncurrent assets and other regulatory assets	(6)	183
Deferred credits and other regulatory liabilities	291	83
Other assets	51
Other liabilities	47	16
NET CASH FLOWS FROM OPERATING ACTIVITIES	1,238	1,638
INVESTING ACTIVITIES
Utility construction expenditures	(1,701)	(1,450)
Cost of removal less salvage	(144)	(118)
Non-utility construction expenditures	(149)	(68)
Investments in solar energy projects	(174)	(258)
Proceeds from grants related to solar energy projects	88	27
Increase in restricted cash	(15)
Proceeds from the termination of LILO transactions	200
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(1,895)	(1,867)
FINANCING ACTIVITIES
Net proceeds of short-term debt	681	340
Preferred stock redemption		(239)
Issuance of long-term debt	919	400
Retirement of long-term debt	(707)	(304)
Issuance of common shares for stock plans, net of repurchases	(4)	(16)
Debt issuance costs	(12)	(4)
Common stock dividends	(540)	(524)
Preferred stock dividends		(3)
NET CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES	337	(350)
CASH AND TEMPORARY CASH INVESTMENTS:
NET CHANGE FOR THE PERIOD	(320)	(579)
BALANCE AT BEGINNING OF PERIOD	394	648
BALANCE AT END OF PERIOD	74	69
Cash paid during the period for:
Interest	372	379
Income taxes	27	46
CECONY [Member]
OPERATING ACTIVITIES
NET INCOME	831	827
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	705	664
Deferred income taxes	364	220
Rate case amortization and accruals	1	32
Common equity component of allowance for funds used during construction	(1)	(2)
Other non-cash items (net)	(72)	84
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable - customers, less allowance for uncollectibles	(39)	(197)
Materials and supplies, including fuel oil and gas in storage	(26)	12
Other receivables and other current assets	(27)	(41)
Prepayments	(347)	(308)
Accounts payable	(180)	50
Pensions and retiree benefits obligations	616	639
Pensions and retiree benefits contributions	(830)	(761)
Accrued taxes	(92)	40
Accrued interest	43	46
Superfund and environmental remediation costs (net)	(6)	7
Deferred charges, noncurrent assets and other regulatory assets	63	84
Deferred credits and other regulatory liabilities	302	88
Other liabilities	64	(21)
NET CASH FLOWS FROM OPERATING ACTIVITIES	1,369	1,463
INVESTING ACTIVITIES
Utility construction expenditures	(1,614)	(1,368)
Cost of removal less salvage	(139)	(115)
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(1,753)	(1,483)
FINANCING ACTIVITIES
Net proceeds of short-term debt	621	332
Preferred stock redemption		(239)
Issuance of long-term debt	700	400
Retirement of long-term debt	(700)	(300)
Debt issuance costs	(7)	(4)
Dividend to parent	(545)	(512)
Preferred stock dividends		(3)
NET CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES	69	(326)
CASH AND TEMPORARY CASH INVESTMENTS:
NET CHANGE FOR THE PERIOD	(315)	(346)
BALANCE AT BEGINNING OF PERIOD	353	372
BALANCE AT END OF PERIOD	38	26
Cash paid during the period for:
Interest	336	344
Income taxes	$ 117	$ 50

Consolidated Balance Sheet (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
NON-UTILITY PLANT
Non-utility property, less accumulated depreciation	$ 581	$ 555
Construction work in progress	29	83
NET PLANT	27,955	26,939
OTHER NONCURRENT ASSETS
Goodwill	429	429
Intangible assets, less accumulated amortization of $4 in 2013 and 2012	4	2
Regulatory assets	9,190	9,705
Other deferred charges and noncurrent assets	238	216
TOTAL OTHER NONCURRENT ASSETS	9,861	10,352
TOTAL ASSETS	41,964	41,209
CURRENT ASSETS
Cash and temporary cash investments	74	394
Special deposits	375	70
Accounts receivable - customers, less allowance for uncollectible accounts	1,273	1,222
Other receivables, less allowance for uncollectible accounts	257	228
Accrued unbilled revenue	425	516
Fuel oil, gas in storage, materials and supplies, at average cost	368	330
Prepayments	521	159
Regulatory assets	46	74
Deferred tax assets - current	186	296
Other current assets	179	162
TOTAL CURRENT ASSETS	3,704	3,451
INVESTMENTS	444	467
UTILITY PLANT, AT ORIGINAL COST
General	2,301	2,302
TOTAL	32,847	31,847
Less: Accumulated depreciation	6,952	6,573
Net	25,895	25,274
Construction work in progress	1,450	1,027
NET UTILITY PLANT	27,345	26,301
CURRENT LIABILITIES
Long-term debt due within one year	483	706
Notes payable	1,220	539
Accounts payable	925	1,215
Customer deposits	316	304
Accrued taxes	379	162
Accrued interest	324	153
Accrued wages	93	94
Fair value of derivative liabilities	25	47
Uncertain income tax liabilities		44
Regulatory liabilities	117	183
Other current liabilities	491	498
TOTAL CURRENT LIABILITIES	4,373	3,945
NONCURRENT LIABILITIES
Obligations under capital leases	2	2
Provision for injuries and damages	195	149
Pensions and retiree benefits	3,816	4,678
Superfund and other environmental costs	512	545
Asset retirement obligations	164	159
Fair value of derivative liabilities	29	31
Uncertain income tax liabilities	8
Other noncurrent liabilities	120	125
TOTAL NONCURRENT LIABILITIES	4,846	5,689
DEFERRED CREDITS AND REGULATORY LIABILITIES
Deferred income taxes and investment tax credits	8,481	8,372
Regulatory liabilities	1,557	1,202
Other deferred credits	48	70
TOTAL DEFERRED CREDITS AND REGULATORY LIABILITIES	10,086	9,644
LONG-TERM DEBT	10,493	10,062
COMMON SHAREHOLDER'S EQUITY (See Statement of Common Shareholder's Equity)	12,166	11,869
TOTAL LIABILITIES AND SHAREHOLDER'S EQUITY	41,964	41,209
CECONY [Member]
NON-UTILITY PLANT
Non-utility property, less accumulated depreciation	5	6
NET PLANT	25,735	24,745
OTHER NONCURRENT ASSETS
Regulatory assets	8,497	8,972
Other deferred charges and noncurrent assets	171	174
TOTAL OTHER NONCURRENT ASSETS	8,668	9,146
TOTAL ASSETS	37,375	36,885
CURRENT ASSETS
Cash and temporary cash investments	38	353
Special deposits	86	65
Accounts receivable - customers, less allowance for uncollectible accounts	1,147	1,108
Other receivables, less allowance for uncollectible accounts	142	106
Accrued unbilled revenue	329	406
Accounts receivable from affiliated companies	35	61
Fuel oil, gas in storage, materials and supplies, at average cost	311	285
Prepayments	428	81
Regulatory assets	42	60
Deferred tax assets - current	123	193
Other current assets	60	69
TOTAL CURRENT ASSETS	2,741	2,787
INVESTMENTS	231	207
UTILITY PLANT, AT ORIGINAL COST
General	2,123	2,126
TOTAL	30,714	29,801
Less: Accumulated depreciation	6,357	6,009
Net	24,357	23,792
Construction work in progress	1,373	947
NET UTILITY PLANT	25,730	24,739
CURRENT LIABILITIES
Long-term debt due within one year	475	700
Notes payable	1,042	421
Accounts payable	737	989
Accounts payable to affiliated companies	16	22
Customer deposits	304	292
Accrued taxes	20	37
Accrued taxes to affiliated companies	140	215
Accrued interest	176	133
Accrued wages	89	84
Fair value of derivative liabilities	19	28
Uncertain income tax liabilities		36
Regulatory liabilities	86	145
Other current liabilities	419	410
TOTAL CURRENT LIABILITIES	3,523	3,512
NONCURRENT LIABILITIES
Obligations under capital leases	2	2
Provision for injuries and damages	188	141
Pensions and retiree benefits	3,414	4,220
Superfund and other environmental costs	403	433
Asset retirement obligations	163	158
Fair value of derivative liabilities	7	11
Other noncurrent liabilities	109	115
TOTAL NONCURRENT LIABILITIES	4,286	5,080
DEFERRED CREDITS AND REGULATORY LIABILITIES
Deferred income taxes and investment tax credits	7,888	7,452
Regulatory liabilities	1,431	1,077
Other deferred credits	43	67
TOTAL DEFERRED CREDITS AND REGULATORY LIABILITIES	9,362	8,596
LONG-TERM DEBT	9,366	9,145
COMMON SHAREHOLDER'S EQUITY (See Statement of Common Shareholder's Equity)	10,838	10,552
TOTAL LIABILITIES AND SHAREHOLDER'S EQUITY	37,375	36,885
Electric [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	23,041	22,376
Electric [Member] \| CECONY [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	21,680	21,079
Gas [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	5,388	5,120
Gas [Member] \| CECONY [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	4,794	4,547
Steam [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	2,117	2,049
Steam [Member] \| CECONY [Member]
UTILITY PLANT, AT ORIGINAL COST
Utility plant, at original cost	$ 2,117	$ 2,049

Consolidated Balance Sheet (Parenthetical) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accounts receivable - customers, allowance for uncollectible accounts	$ 95	$ 94
Other receivables, allowance for uncollectible accounts	8	10
Non-utility property, accumulated depreciation	84	68
Intangible assets, accumulated amortization	4	4
CECONY [Member]
Accounts receivable - customers, allowance for uncollectible accounts	89	87
Other receivables, allowance for uncollectible accounts	6	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 dividends	(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 (loss)	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	931	824
NET INCOME	934	827
Cumulative preferred dividends	(3)	(3)
BALANCE at Sep. 30, 2012	11,842	10,532		589	4,991	4,234				(61)	(60)		(10)	(962)
BALANCE (In Shares) at Sep. 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						214
NET INCOME		163						163
Common stock dividends	(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 (loss)	(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
Net income for common stock	440	389					440
NET INCOME	440	389						389
Common stock dividends	(177)	(171)					(177)	(171)
Issuance of common shares for stock plans, net of repurchases	(2)								(2)
Issuance of common shares for stock plans, net of repurchases (In Shares)			(11,100)						11,100
Other comprehensive income (loss)	2											2
BALANCE at Sep. 30, 2012	11,842	10,532	32	589	4,991	4,234	7,967	6,741	(1,037)	(61)	(60)	(50)	(10)	(962)
BALANCE (In Shares) at Sep. 30, 2012			292,871,896	235,488,094					23,210,700
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 dividends	(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 (loss)	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)		(9)	(962)
BALANCE (In Shares) at Dec. 31, 2012				235,488,094
Net income for common stock	828	831
NET INCOME	828	831
BALANCE at Sep. 30, 2013	12,166	10,838		589	4,990	4,234				(61)	(61)		(9)	(962)
BALANCE (In Shares) at Sep. 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						172
NET INCOME		153						153
Common stock dividends	(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 (loss)	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
Net income for common stock	464	401					464
NET INCOME	464	401						401
Common stock dividends	(180)	(181)					(180)	(181)
Issuance of common shares for stock plans, net of repurchases	(3)								(3)
Issuance of common shares for stock plans, net of repurchases (In Shares)			(34,931)						34,931
Other comprehensive income (loss)	2											2
BALANCE at Sep. 30, 2013	$ 12,166	$ 10,838	$ 32	$ 589	$ 4,990	$ 4,234	$ 8,285	$ 7,047	$ (1,034)	$ (61)	$ (61)	$ (46)	$ (9)	$ (962)
BALANCE (In Shares) at Sep. 30, 2013			292,928,355	235,488,094					23,154,241

General	9 Months Ended
General	Sep. 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 Reports on Form 10-Q for the quarterly periods ended March 31, 2013 and June 30, 2013. 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 Reports on Form 10-Q for the quarterly periods ended March 31, 2013 and June 30, 2013. 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

9 Months Ended

Sep. 30, 2013

Summary of Significant Accounting Policies

Note A — Summary of Significant Accounting Policies

Reclassifications and Revisions

Prior period amounts have been reclassified where necessary to conform to the current period presentation.

Con Edison’s consolidated statement of cash flows for the six months ended June 30, 2013, incorrectly reduced net cash flows from financing activities and increased net cash flows from operating activities by an amount equal to the $108 million of net cash proceeds from the termination of the 1999 LILO transaction. A revision will be made on Con Edison’s consolidated statement of cash flows for the six months ended June 30, 2013 when the company files its Form 10-Q for the quarterly period ended June 30, 2014. The company does not deem this revision material to its consolidated financial statements for the six months ended June 30, 2013.

Earnings Per Common Share

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


	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
*(Millions of Dollars, except per share amounts/Shares in Millions)*	2013		2012		2013		2012
Net income for common stock	$	464	$	440	$	828	$	931
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		1.7		1.4		1.7
Adjusted weighted average common shares outstanding – diluted		294.3		294.6		294.3		294.6
Net income for common stock per common share – basic	$	1.58	$	1.50	$	2.83	$	3.18
Net income for common stock per common share – diluted	$	1.58	$	1.49	$	2.81	$	3.16

The computation of diluted EPS for the three and nine months ended September 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 nine months ended September 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, net of tax of $1 and $- for Con Edison and CECONY, respectively		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	)
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 September 30, 2013	$	2		$	—
Accumulated OCI, net of taxes, at September 30, 2013 (b)	$	(46	)	$	(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

Reclassifications and Revisions

Prior period amounts have been reclassified where necessary to conform to the current period presentation.

Earnings Per Common Share

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


	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
*(Millions of Dollars, except per share amounts/Shares in Millions)*	2013		2012		2013		2012
Net income for common stock	$	464	$	440	$	828	$	931
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		1.7		1.4		1.7
Adjusted weighted average common shares outstanding – diluted		294.3		294.6		294.3		294.6
Net income for common stock per common share – basic	$	1.58	$	1.50	$	2.83	$	3.18
Net income for common stock per common share – diluted	$	1.58	$	1.49	$	2.81	$	3.16

Changes in Accumulated Other Comprehensive Income by Component

For the three and nine months ended September 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, net of tax of $1 and $- for Con Edison and CECONY, respectively		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	)
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 September 30, 2013	$	2		$	—
Accumulated OCI, net of taxes, at September 30, 2013 (b)	$	(46	)	$	(9	)

(a)

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

- Definition

The entire disclosure for all significant accounting policies of the reporting entity.

+ References+ Details

Regulatory Matters

9 Months Ended

Sep. 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 August 2013, the New York State Public Service Commission (NYSPSC) staff submitted its initial briefs which support decreases in the company’s electric, gas and steam rates of $146 million, $95 million and $10 million, respectively, reflecting, among other things, a return on common equity of 8.7 percent and a common equity ratio of 48 percent. In September 2013, the company submitted its reply briefs supporting increases in its electric, gas and steam rates of $418 million, $27 million and $8 million, respectively, reflecting, among other things, a return on common equity of 10.1 percent and a common equity ratio of approximately 50 percent. In October 2013, the NYSPSC’s Chief Administrative Law Judge appointed a settlement judge to assist in settlement discussions among the parties in these rate proceedings. There is no assurance that there will be a settlement, and any settlement would be subject to NYSPSC approval. Also, in October 2013, the company agreed to extend by one month the date by which the NYSPSC is required to issue a decision on the company’s rate requests, subject to a “make whole” provision that would keep the company and its customers in the same position they would have been absent the extension.

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 September 30, 2013, the company had collected an estimated $1,318 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 September 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 September 30, 2013, CECONY and O&R incurred response and restoration costs for Superstorm Sandy of $471 million and $92 million, respectively (including capital expenditures of $143 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 is investigating, and the New York State Attorney General investigated, 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 September 30, 2013, RECO had $28 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 September 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		$5,011		$5,677		$4,779		$5,407
Future income tax		2,035		1,922		1,929		1,831
Environmental remediation costs		704		730		591		615
Deferred storm costs		451		432		340		309
Pension and other postretirement benefits deferrals		229		183		201		154
Revenue taxes		191		176		182		170
Surcharge for New York State assessment		119		73		113		68
Net electric deferrals		88		102		88		102
Unamortized loss on reacquired debt		67		74		64		70
Deferred derivative losses – long-term		34		40		13		20
O&R transition bond charges		34		39		—		—
Preferred stock redemption		28		29		28		29
Property tax reconciliation		20		16		—		—
Workers’ compensation		16		19		16		19
Other		163		193		153		178
Regulatory assets – long-term		9,190		9,705		8,497		8,972
Deferred derivative losses – current		45		69		42		60
Recoverable energy costs – current		1		5		—		—
Regulatory assets – current		46		74		42		60
Total Regulatory Assets		$9,236		$9,779		$8,539		$9,032
Regulatory liabilities
Allowance for cost of removal less salvage		$ 522		$ 503		$ 436		$ 420
Property tax reconciliation		290		187		290		187
Property tax refunds		130		7		129		6
Net unbilled revenue deferrals		104		136		104		136
Long-term interest rate reconciliation		94		62		94		62
World Trade Center settlement proceeds		62		62		62		62
Carrying charges on T&D net plant – electric and steam		30		31		20		13
Expenditure prudence proceeding		16		14		16		14
Other		309		200		280		177
Regulatory liabilities – long-term		1,557		1,202		1,431		1,077
Refundable energy costs – current		64		82		36		48
Revenue decoupling mechanism		51		72		49		68
Deferred derivative gains – current		2		—		1		—
Electric surcharge offset		—		29		—		29
Regulatory liabilities – current		117		183		86		145
Total Regulatory Liabilities		$1,674		$1,385		$1,517		$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 September 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		$5,011		$5,677		$4,779		$5,407
Future income tax		2,035		1,922		1,929		1,831
Environmental remediation costs		704		730		591		615
Deferred storm costs		451		432		340		309
Pension and other postretirement benefits deferrals		229		183		201		154
Revenue taxes		191		176		182		170
Surcharge for New York State assessment		119		73		113		68
Net electric deferrals		88		102		88		102
Unamortized loss on reacquired debt		67		74		64		70
Deferred derivative losses – long-term		34		40		13		20
O&R transition bond charges		34		39		—		—
Preferred stock redemption		28		29		28		29
Property tax reconciliation		20		16		—		—
Workers’ compensation		16		19		16		19
Other		163		193		153		178
Regulatory assets – long-term		9,190		9,705		8,497		8,972
Deferred derivative losses – current		45		69		42		60
Recoverable energy costs – current		1		5		—		—
Regulatory assets – current		46		74		42		60
Total Regulatory Assets		$9,236		$9,779		$8,539		$9,032
Regulatory liabilities
Allowance for cost of removal less salvage		$ 522		$ 503		$ 436		$ 420
Property tax reconciliation		290		187		290		187
Property tax refunds		130		7		129		6
Net unbilled revenue deferrals		104		136		104		136
Long-term interest rate reconciliation		94		62		94		62
World Trade Center settlement proceeds		62		62		62		62
Carrying charges on T&D net plant – electric and steam		30		31		20		13
Expenditure prudence proceeding		16		14		16		14
Other		309		200		280		177
Regulatory liabilities – long-term		1,557		1,202		1,431		1,077
Refundable energy costs – current		64		82		36		48
Revenue decoupling mechanism		51		72		49		68
Deferred derivative gains – current		2		—		1		—
Electric surcharge offset		—		29		—		29
Regulatory liabilities – current		117		183		86		145
Total Regulatory Liabilities		$1,674		$1,385		$1,517		$1,222

Capitalization

9 Months Ended

Sep. 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 energy 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)*	September 30, 2013				December 31, 2012
Long-Term Debt (including current portion)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Con Edison		$10,976		$12,213		$10,768		$12,935
CECONY		$ 9,841		$10,925		$ 9,845		$11,751

Fair values of long-term debt have been estimated primarily using available market information. For Con Edison, $11,577 million and $636 million of the fair value of long-term debt at September 30, 2013 are classified as Level 2 and Level 3, respectively. For CECONY, $10,289 million and $636 million of the fair value of long-term debt at September 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)*	September 30, 2013				December 31, 2012
Long-Term Debt (including current portion)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Con Edison		$10,976		$12,213		$10,768		$12,935
CECONY		$ 9,841		$10,925		$ 9,845		$11,751

Short-Term Borrowing	9 Months Ended
Short-Term Borrowing	Sep. 30, 2013
Short-Term Borrowing	Note D — Short-Term Borrowing At September 30, 2013, Con Edison had $1,220 million of commercial paper outstanding of which $1,042 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 September 30, 2013 and December 31, 2012, no loans were outstanding under the Companies’ credit agreement and $29 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. In 2013, the termination date under the credit agreement was extended from October 2016 to October 2017 with respect to lenders with aggregate commitments under the credit agreement of approximately $2.1 billion.
CECONY [Member]
Short-Term Borrowing	Note D — Short-Term Borrowing At September 30, 2013, Con Edison had $1,220 million of commercial paper outstanding of which $1,042 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 September 30, 2013 and December 31, 2012, no loans were outstanding under the Companies’ credit agreement and $29 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. In 2013, the termination date under the credit agreement was extended from October 2016 to October 2017 with respect to lenders with aggregate commitments under the credit agreement of approximately $2.1 billion.

- Definition

The entire disclosure for short-term debt.

+ References+ Details

Pension Benefits

9 Months Ended

Sep. 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 nine months ended September 30, 2013 and 2012 were as follows:


	For the Three Months Ended September 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	)		(176	)		(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			$ 199			$ 208			$ 185
Amortization of regulatory asset		1			—			1			—
TOTAL PERIODIC BENEFIT COST		$ 224			$ 199			$ 209			$ 185
Cost capitalized		(86	)		(64	)		(78	)		(60	)
Reconciliation to rate level		(31	)		—			(34	)		(1	)
Cost charged to operating expenses		$ 107			$ 135			$ 97			$ 124


	For the Nine Months Ended September 30,
	Con Edison						CECONY
*(Millions of Dollars)*	2013			2012			2013			2012
Service cost – including administrative expenses		$ 200			$ 177			$ 186			$ 165
Interest cost on projected benefit obligation		403			410			377			385
Expected return on plan assets		(563	)		(528	)		(534	)		(503	)
Recognition of net actuarial loss		624			531			591			503
Recognition of prior service costs		4			6			3			4
NET PERIODIC BENEFIT COST		$ 668			$ 596			$ 623			$ 554
Amortization of regulatory asset		2			1			2			1
TOTAL PERIODIC BENEFIT COST		$ 670			$ 597			$ 625			$ 555
Cost capitalized		(256	)		(200	)		(241	)		(186	)
Reconciliation to rate level		(55	)		(37	)		(56	)		(36	)
Cost charged to operating expenses		$ 359			$ 360			$ 328			$ 333

Contributions

The Companies made contributions to the pension plan during 2013 of $867 million (of which $810 million was contributed by CECONY). The Companies’ policy is to fund their accounting cost to the extent tax deductible. During the first nine months of 2013, CECONY also 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 nine months ended September 30, 2013 and 2012 were as follows:


	For the Three Months Ended September 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	)		(176	)		(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			$ 199			$ 208			$ 185
Amortization of regulatory asset		1			—			1			—
TOTAL PERIODIC BENEFIT COST		$ 224			$ 199			$ 209			$ 185
Cost capitalized		(86	)		(64	)		(78	)		(60	)
Reconciliation to rate level		(31	)		—			(34	)		(1	)
Cost charged to operating expenses		$ 107			$ 135			$ 97			$ 124


	For the Nine Months Ended September 30,
	Con Edison						CECONY
*(Millions of Dollars)*	2013			2012			2013			2012
Service cost – including administrative expenses		$ 200			$ 177			$ 186			$ 165
Interest cost on projected benefit obligation		403			410			377			385
Expected return on plan assets		(563	)		(528	)		(534	)		(503	)
Recognition of net actuarial loss		624			531			591			503
Recognition of prior service costs		4			6			3			4
NET PERIODIC BENEFIT COST		$ 668			$ 596			$ 623			$ 554
Amortization of regulatory asset		2			1			2			1
TOTAL PERIODIC BENEFIT COST		$ 670			$ 597			$ 625			$ 555
Cost capitalized		(256	)		(200	)		(241	)		(186	)
Reconciliation to rate level		(55	)		(37	)		(56	)		(36	)
Cost charged to operating expenses		$ 359			$ 360			$ 328			$ 333

Contributions

Other Postretirement Benefits

9 Months Ended

Sep. 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 nine months ended September 30, 2013 and 2012 were as follows:


	For the Three Months Ended September 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			16
Expected return on plan assets		(19	)		(21	)		(17	)		(19	)
Recognition of net actuarial loss		16			24			14			22
Recognition of prior service cost		(7	)		(5	)		(6	)		(4	)
NET PERIODIC POSTRETIREMENT BENEFIT COST		$ 9			$ 22			$ 8			$ 20
Cost capitalized		(3	)		(8	)		(3	)		(7	)
Reconciliation to rate level		14			3			12			3
Cost charged to operating expenses		$ 20			$ 17			$ 17			$ 16


	For the Nine Months Ended September 30,
	Con Edison						CECONY
*(Millions of Dollars)*	2013			2012			2013			2012
Service cost		$ 18			$ 20			$ 14			$ 15
Interest cost on accumulated other postretirement benefit obligation		40			55			34			48
Expected return on plan assets		(58	)		(64	)		(51	)		(56	)
Recognition of net actuarial loss		48			73			43			65
Recognition of prior service cost		(20	)		(16	)		(17	)		(13	)
Recognition of transition obligation		—			1			—			1
NET PERIODIC POSTRETIREMENT BENEFIT COST		$ 28			$ 69			$ 23			$ 60
Cost capitalized		(10	)		(24	)		(9	)		(20	)
Reconciliation to rate level		43			15			37			12
Cost charged to operating expenses		$ 61			$ 60			$ 51			$ 52

Contributions

Con Edison made a contribution of $9 million, nearly all of which is for CECONY, to the other postretirement benefit plans in 2013.

Environmental Matters

9 Months Ended

Sep. 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 September 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		$439		$462		$332		$351
Other Superfund Sites		73		83		71		82
Total		$512		$545		$403		$433
Regulatory assets		$704		$730		$591		$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 nine months ended September 30, 2013 and 2012 were as follows:


	For the Three Months Ended September 30,
	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Remediation costs incurred		$10		$3		$10		$1
Insurance recoveries received		—		—		—		—


	For the Nine Months Ended September 30,
	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Remediation costs incurred		$35		$18		$30		$15
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 September 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		$91		$94		$86		$89
Regulatory assets – workers’ compensation		$16		$19		$16		$19

CECONY [Member]

Environmental Matters

Note G — Environmental Matters

Superfund Sites

The accrued liabilities and regulatory assets related to Superfund Sites at September 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		$439		$462		$332		$351
Other Superfund Sites		73		83		71		82
Total		$512		$545		$403		$433
Regulatory assets		$704		$730		$591		$615

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


	For the Three Months Ended September 30,
	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Remediation costs incurred		$10		$3		$10		$1
Insurance recoveries received		—		—		—		—


	For the Nine Months Ended September 30,
	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Remediation costs incurred		$35		$18		$30		$15
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		$91		$94		$86		$89
Regulatory assets – workers’ compensation		$16		$19		$16		$19

- Definition

The entire disclosure for environmental loss contingencies, such as presence of hazardous waste, relevant information from reports issued by regulators, and estimated costs to achieve compliance with regulatory requirements. This element may be used for all of an entity's disclosures about environmental loss contingencies.

+ References+ Details

Other Material Contingencies

9 Months Ended

Sep. 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 90 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 notified its insurers of the incident and believes that the policies in force at the time of the incident will cover the company’s costs to satisfy its liability to others in connection with the suits. At September 30, 2013, the company has accrued its estimated liability for the suits of $50 million and an insurance receivable in the same amount.

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. In August 2013, the 1997 LILO transaction was terminated, resulting in a $26 million gain (after-tax) and net cash proceeds of $92 million. The effect on Con Edison’s consolidated income statement is as follows:


*(Millions of Dollars)*	For the Three Months Ended September 30, 2013			For the Nine Months Ended September 30, 2013
Increase/(decrease) to non-utility operating revenues	$	44		$	(27	)
(Increase)/decrease to other interest expense		—			(131	)
Income tax benefit/(expense)		(18	)		63
Total increase/(decrease) in net income	$	26		$	(95	)

The transactions did not impact earnings in 2012.

At September 30, 2013, the company had terminated its LILO transactions and no longer had an investment recorded for these leases in its consolidated balance sheet. 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. In August 2013, an additional $30 million of the deposit was returned from the IRS at the company’s request. In the third quarter of 2013, the IRS completed its audits for the tax years 1998 through 2011 and the company expects to apply a portion of the remaining deposited amounts against its federal tax liability during the fourth quarter of 2013. The company is currently amending its state tax returns for all years covered by the LILOs, and expects that the balance of the deposit will be applied to satisfy its related state tax liability.

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 $1,272 million and $859 million at September 30, 2013 and December 31, 2012, respectively.

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


Guarantee Type	0 – 3 years		4 – 10 years		> 10 years		Total
	*(Millions of Dollars)*
Energy transactions	$	705	$	52	$	25	$	782
Solar energy projects		443		—		4		447
Intra-company guarantees		16		—		—		16
Other guarantees		27		—		—		27
Total	$	1,191	$	52	$	29	$	1,272

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.

Solar Energy Projects — Con Edison and Con Edison Development guarantee payments associated with the investment in solar energy generation facilities on behalf of their wholly-owned subsidiaries. In addition, Con Edison Development has entered into a guarantee ($80 million maximum) on behalf of an entity in which it has a 50 percent interest (see Note M) in connection with the construction of solar energy generation facilities. Con Edison Development also provided $4 million in guarantees to Travelers Insurance Company for indemnity agreements for surety bonds in connection with the construction and operation of solar energy facilities performed by its subsidiaries.

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; 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 September 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 September 30, 2013			For the Nine Months Ended September 30, 2013
Increase/(decrease) to non-utility operating revenues	$	44		$	(27	)
(Increase)/decrease to other interest expense		—			(131	)
Income tax benefit/(expense)		(18	)		63
Total increase/(decrease) in net income	$	26		$	(95	)

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 September 30, 2013 is as follows:


Guarantee Type	0 – 3 years		4 – 10 years		> 10 years		Total
	*(Millions of Dollars)*
Energy transactions	$	705	$	52	$	25	$	782
Solar energy projects		443		—		4		447
Intra-company guarantees		16		—		—		16
Other guarantees		27		—		—		27
Total	$	1,191	$	52	$	29	$	1,272

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:

•

- Definition

The entire disclosure for commitments and contingencies.

+ References+ Details

Income Tax	9 Months Ended
Income Tax	Sep. 30, 2013
Income Tax	Note I — Income Tax Con Edison’s income tax expense decreased to $250 million for the three months ended September 30, 2013, from $261 million for the three months ended September 30, 2012. The effective tax rates for the three months ended September 30, 2013 and 2012 were 35 percent and 37 percent, respectively. The decrease in the effective tax rate in 2013 is due primarily to reductions in liabilities for uncertain tax positions related to the completion of the IRS audits in the third quarter of 2013 (see “Uncertain Tax Positions,” below) and favorable tax adjustments recorded in conjunction with filing Con Edison’s 2012 consolidated federal tax return in September. The favorable tax adjustments are primarily due to higher flow-through federal income tax benefits related to plant and higher renewable energy tax credits. Con Edison’s income tax expense decreased to $373 million for the nine months ended September 30, 2013, from $501 million for the nine months ended September 30, 2012. The effective tax rates for the nine months ended September 30, 2013 and 2012 were 31 percent and 35 percent, respectively. The decrease in the effective tax rate in 2013 is due primarily to the favorable tax adjustments discussed above and 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 $222 million for the three months ended September 30, 2013, from $227 million for the three months ended September 30, 2012. The effective tax rates for the three months ended September 30, 2013 and 2012 were 36 percent and 37 percent, respectively. CECONY’s income tax expense decreased to $431 million for the nine months ended September 30, 2013, from $436 million for the nine months ended September 30, 2012. The effective tax rates for the nine months ended September 30, 2013 and 2012 were 34 percent and 35 percent, respectively. The decreases in the effective tax rates for the three and nine months ended September 30, 2013, are due primarily to higher flow-through federal income tax benefits ($7 million) reflected in CECONY’s federal tax return filed in September. In September 2013, the IRS issued final regulations that provide guidance on the appropriate tax treatment of costs incurred to acquire, produce or improve tangible property. The new regulations, effective beginning in 2014, permit an acceleration of tax deductions for certain materials and supplies recorded as inventory for financial accounting purposes. The application of these regulations is not expected to have a material impact on the Companies’ financial position, results of operations or liquidity. 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 nine months ended September 30, 2013. In the third quarter of 2013, the IRS completed its audits for the tax years 1998 through 2011 and the Companies recognized approximately $13 million of income tax benefits ($7 million for CECONY), including $6 million that favorably affected Con Edison’s effective tax rate for the three and nine months ended September 30, 2013. There were no material changes to the Companies’ estimated liabilities for uncertain tax positions during the nine months ended September 30, 2012. At September 30, 2013, the estimated liabilities for uncertain tax positions for Con Edison were $8 million and an immaterial amount for CECONY. 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 third quarter of 2013, the Companies’ reversed $5 million ($3 million for CECONY) in accrued interest expense associated with reducing the Companies’ estimated liabilities for uncertain tax positions. The Companies’ accrued interest on uncertain tax positions at September 30, 2013 and December 31, 2012 was immaterial. The Companies reasonably expect to resolve an immaterial amount of their uncertain tax positions with the IRS within the next twelve months, and accordingly, Con Edison has reflected its estimated liability for uncertain tax positions as noncurrent liabilities on its consolidated balance sheet. At September 30, 2013, the total amount of unrecognized tax benefits that, if recognized, would affect the Companies’ effective tax rate is $5 million for Con Edison and an immaterial amount for CECONY.
CECONY [Member]
Income Tax	Note I — Income Tax Con Edison’s income tax expense decreased to $250 million for the three months ended September 30, 2013, from $261 million for the three months ended September 30, 2012. The effective tax rates for the three months ended September 30, 2013 and 2012 were 35 percent and 37 percent, respectively. The decrease in the effective tax rate in 2013 is due primarily to reductions in liabilities for uncertain tax positions related to the completion of the IRS audits in the third quarter of 2013 (see “Uncertain Tax Positions,” below) and favorable tax adjustments recorded in conjunction with filing Con Edison’s 2012 consolidated federal tax return in September. The favorable tax adjustments are primarily due to higher flow-through federal income tax benefits related to plant and higher renewable energy tax credits. Con Edison’s income tax expense decreased to $373 million for the nine months ended September 30, 2013, from $501 million for the nine months ended September 30, 2012. The effective tax rates for the nine months ended September 30, 2013 and 2012 were 31 percent and 35 percent, respectively. The decrease in the effective tax rate in 2013 is due primarily to the favorable tax adjustments discussed above and 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 $222 million for the three months ended September 30, 2013, from $227 million for the three months ended September 30, 2012. The effective tax rates for the three months ended September 30, 2013 and 2012 were 36 percent and 37 percent, respectively. CECONY’s income tax expense decreased to $431 million for the nine months ended September 30, 2013, from $436 million for the nine months ended September 30, 2012. The effective tax rates for the nine months ended September 30, 2013 and 2012 were 34 percent and 35 percent, respectively. The decreases in the effective tax rates for the three and nine months ended September 30, 2013, are due primarily to higher flow-through federal income tax benefits ($7 million) reflected in CECONY’s federal tax return filed in September. In September 2013, the IRS issued final regulations that provide guidance on the appropriate tax treatment of costs incurred to acquire, produce or improve tangible property. The new regulations, effective beginning in 2014, permit an acceleration of tax deductions for certain materials and supplies recorded as inventory for financial accounting purposes. The application of these regulations is not expected to have a material impact on the Companies’ financial position, results of operations or liquidity. 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 nine months ended September 30, 2013. In the third quarter of 2013, the IRS completed its audits for the tax years 1998 through 2011 and the Companies recognized approximately $13 million of income tax benefits ($7 million for CECONY), including $6 million that favorably affected Con Edison’s effective tax rate for the three and nine months ended September 30, 2013. There were no material changes to the Companies’ estimated liabilities for uncertain tax positions during the nine months ended September 30, 2012. At September 30, 2013, the estimated liabilities for uncertain tax positions for Con Edison were $8 million and an immaterial amount for CECONY. 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 third quarter of 2013, the Companies’ reversed $5 million ($3 million for CECONY) in accrued interest expense associated with reducing the Companies’ estimated liabilities for uncertain tax positions. The Companies’ accrued interest on uncertain tax positions at September 30, 2013 and December 31, 2012 was immaterial. The Companies reasonably expect to resolve an immaterial amount of their uncertain tax positions with the IRS within the next twelve months, and accordingly, Con Edison has reflected its estimated liability for uncertain tax positions as noncurrent liabilities on its consolidated balance sheet. At September 30, 2013, the total amount of unrecognized tax benefits that, if recognized, would affect the Companies’ effective tax rate is $5 million for Con Edison and an immaterial amount for CECONY.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References+ Details

Financial Information by Business Segment

9 Months Ended

Sep. 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 September 30,
	Operating revenues				Inter-segment revenues						Depreciation and amortization				Operating income
*(Millions of Dollars)*	2013		2012		2013			2012			2013		2012		2013			2012
CECONY
Electric	$	2,622	$	2,611	$	4		$	4		$	188	$	179	$	811		$	812
Gas		199		189		1			1			33		31		(24	)		(21	)
Steam		72		68		22			20			16		15		(35	)		(37	)
Consolidation adjustments		—		—		(27	)		(25	)		—		—		—			—
Total CECONY	$	2,893	$	2,868	$	—		$	—		$	237	$	225	$	752		$	754
O&R
Electric	$	200	$	199	$	—		$	—		$	10	$	10	$	46		$	50
Gas		26		27		—			—			4		3		(7	)		(6	)
Total O&R	$	226	$	226	$	—		$	—		$	14	$	13	$	39		$	44
Competitive energy businesses	$	365	$	344	$	—		$	2		$	6	$	2	$	63		$	53
Other*		—		—		—			(2	)		1		—		1			—
Total Con Edison	$	3,484	$	3,438	$	—		$	—		$	258	$	240	$	855		$	851

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


	For the Nine Months Ended September 30,
	Operating revenues						Inter-segment revenues						Depreciation and amortization				Operating income
*(Millions of Dollars)*	2013			2012			2013			2012			2013		2012		2013		2012
CECONY
Electric	$	6,309		$	6,307		$	12		$	11		$	559	$	527	$	1,307	$	1,383
Gas		1,190			1,017			4			4			97		89		272		255
Steam		522			414			60			58			49		48		80		40
Consolidation adjustments		—			—			(76	)		(73	)		—		—		—		—
Total CECONY	$	8,021		$	7,738		$	—		$	—		$	705	$	664	$	1,659	$	1,678
O&R
Electric	$	492		$	457		$	—		$	—		$	31	$	28	$	81	$	74
Gas		143			144			—			—			11		11		20		26
Total O&R	$	635		$	601		$	—		$	—		$	42	$	39	$	101	$	100
Competitive energy businesses	$	834		$	954		$	4		$	6		$	16	$	6	$	7	$	111
Other*		(3	)		(6	)		(4	)		(6	)		1		—		—		(3	)
Total Con Edison	$	9,487		$	9,287		$	—		$	—		$	764	$	709	$	1,767	$	1,886

*	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 September 30,
	Operating revenues				Inter-segment revenues						Depreciation and amortization				Operating income
*(Millions of Dollars)*	2013		2012		2013			2012			2013		2012		2013			2012
CECONY
Electric	$	2,622	$	2,611	$	4		$	4		$	188	$	179	$	811		$	812
Gas		199		189		1			1			33		31		(24	)		(21	)
Steam		72		68		22			20			16		15		(35	)		(37	)
Consolidation adjustments		—		—		(27	)		(25	)		—		—		—			—
Total CECONY	$	2,893	$	2,868	$	—		$	—		$	237	$	225	$	752		$	754
O&R
Electric	$	200	$	199	$	—		$	—		$	10	$	10	$	46		$	50
Gas		26		27		—			—			4		3		(7	)		(6	)
Total O&R	$	226	$	226	$	—		$	—		$	14	$	13	$	39		$	44
Competitive energy businesses	$	365	$	344	$	—		$	2		$	6	$	2	$	63		$	53
Other*		—		—		—			(2	)		1		—		1			—
Total Con Edison	$	3,484	$	3,438	$	—		$	—		$	258	$	240	$	855		$	851

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


	For the Nine Months Ended September 30,
	Operating revenues						Inter-segment revenues						Depreciation and amortization				Operating income
*(Millions of Dollars)*	2013			2012			2013			2012			2013		2012		2013		2012
CECONY
Electric	$	6,309		$	6,307		$	12		$	11		$	559	$	527	$	1,307	$	1,383
Gas		1,190			1,017			4			4			97		89		272		255
Steam		522			414			60			58			49		48		80		40
Consolidation adjustments		—			—			(76	)		(73	)		—		—		—		—
Total CECONY	$	8,021		$	7,738		$	—		$	—		$	705	$	664	$	1,659	$	1,678
O&R
Electric	$	492		$	457		$	—		$	—		$	31	$	28	$	81	$	74
Gas		143			144			—			—			11		11		20		26
Total O&R	$	635		$	601		$	—		$	—		$	42	$	39	$	101	$	100
Competitive energy businesses	$	834		$	954		$	4		$	6		$	16	$	6	$	7	$	111
Other*		(3	)		(6	)		(4	)		(6	)		1		—		—		(3	)
Total Con Edison	$	9,487		$	9,287		$	—		$	—		$	764	$	709	$	1,767	$	1,886

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

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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+ Details

Derivative Instruments and Hedging Activities

9 Months Ended

Sep. 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 September 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	$	80		$	(52	)	$	28	(a)	$	—	$	—	$	28	(a)
Derivative liabilities		(124	)		74			(50	)		—		—		(50	)
Net derivative assets/(liabilities)	$	(44	)	$	22		$	(22	)(a)	$	—	$	—	$	(22	)(a)
CECONY
Derivative assets	$	27		$	(18	)	$	9	(a)	$	—	$	—	$	9	(a)
Derivative liabilities		(58	)		33			(25	)		—		—		(25	)
Net derivative assets/(liabilities)	$	(31	)	$	15		$	(16	)(a)	$	—	$	—	$	(16	)(a)

(a)

At September 30, 2013, Con Edison and CECONY had margin deposits of $34 million and $14 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 September 30, 2013, Con Edison and CECONY had $110 million and $14 million of credit exposure in connection with energy supply and hedging activities, net of collateral, respectively. Con Edison’s net credit exposure consisted of $42 million with independent system operators, $37 million with commodity exchange brokers, $30 million with investment-grade counterparties and $1 million with non-investment grade or 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 September 30, 2013 were:


*(Millions of Dollars)*	Fair Value of Commodity Derivatives(a) Balance Sheet Location	Con Edison			CECONY
Derivative Assets
Current	Other current assets	$	55		$	18
Long-term	Other deferred charges and noncurrent assets		25			9
Total derivative assets		$	80		$	27
Impact of netting			(18	)		(4	)
Net derivative assets		$	62		$	23
Derivative Liabilities
Current	Fair value of derivative liabilities	$	71		$	40
Long-term	Fair value of derivative liabilities		53			18
Total derivative liabilities		$	124		$	58
Impact of netting			(74	)		(33	)
Net derivative liabilities		$	50		$	25

(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 nine months ended September 30, 2013:


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Three Months Ended September 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	$	—		$	—
Long-term	Deferred derivative gains		—			—
Total deferred gains/(losses)		$	—		$	—
Current	Deferred derivative losses	$	11		$	9
Current	Recoverable energy costs		(19	)		(17	)
Long-term	Deferred derivative losses		6			7
Total deferred gains/(losses)		$	(2	)	$	(1	)
Net deferred gains/(losses)		$	(2	)	$	(1	)
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense	$	3	(b)	$	—
	Gas purchased for resale		(6	)		—
	Non-utility revenue		7			—
Total pre-tax gain/(loss) recognized in income		$	4		$	—

(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 September 30, 2013, Con Edison recorded in purchased power expense an unrealized pre-tax gain of $6 million.


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Nine Months Ended September 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		$ 1			$ 1
Long-term	Deferred derivative gains		—			—
Total deferred gains/(losses)			$ 1			$ 1
Current	Deferred derivative losses		$ 24			$ 19
Current	Recoverable energy costs		(22	)		(19	)
Long-term	Deferred derivative losses		3			7
Total deferred gains/(losses)			$ 5			$ 7
Net deferred gains/(losses)			$ 6			$ 8
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense		$ 32	(b)		$ —
	Gas purchased for resale		(17	)		—
	Non-utility revenue		8			—
Total pre-tax gain/(loss) recognized in income			$ 23			$ —

(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 nine months ended September 30, 2013, Con Edison recorded in purchased power expense an unrealized pre-tax gain of $22 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 nine months ended September 30, 2012:


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Three Months Ended September 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		$ 5			$ 5
Long-term	Deferred derivative gains		1			1
Total deferred gains/(losses)			$ 6			$ 6
Current	Deferred derivative losses		$ 51			$ 42
Current	Recoverable energy costs		(60	)		(52	)
Long-term	Deferred derivative losses		22			20
Total deferred gains/(losses)			$ 13			$ 10
Net deferred gains/(losses)			$ 19			$ 16
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense		$ 9	(b)		$ —
	Gas purchased for resale		—			—
	Non-utility revenue		1			—
Total pre-tax gain/(loss) recognized in income			$ 10			$ —

(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 September 30, 2012, Con Edison recorded in purchased power expense an unrealized pre-tax gain of $30 million.


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Nine Months Ended September 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		$ 5			$ 5
Long-term	Deferred derivative gains		1			1
Total deferred gains/(losses)			$ 6			$ 6
Current	Deferred derivative losses		$ 89			$ 78
Current	Recoverable energy costs		(187	)		(164	)
Long-term	Deferred derivative losses		13			19
Total deferred gains/(losses)			$ (85	)		$ (67	)
Net deferred gains/(losses)			$ (79	)		$ (61	)
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense		$ (49	)(b)		$ —
	Gas purchased for resale		(2	)		—
	Non-utility revenue		(11	)(b)		—
Total pre-tax gain/(loss) recognized in income			$ (62	)		$ —

(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 nine months ended September 30, 2012, Con Edison recorded in non-utility revenues and purchased power expense an unrealized pre-tax gain/(loss) of $(13) million and $75 million, respectively.

As of September 30, 2013, Con Edison had 1,187 contracts, including 628 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		470		13,643,994		83		11,625		634		79,090,035		1,187
CECONY		82		3,127,600		4		1,200		542		75,470,000		628

(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 September 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		$31			$25
Collateral posted		$ —			$ —
Additional collateral (b) (downgrade one level from current ratings)		$ —			$ —
Additional collateral (b) (downgrade to below investment grade from current ratings)		$42	(c)		$29	(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 September 30, 2013, would have amounted to an estimated $35 million and $14 million 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 September 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 $37 million.

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 September 30, 2013 was an unrealized loss of $3 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 nine months ended September 30, 2013 was $1 million and $3 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 September 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	$	80		$	(52	)	$	28	(a)	$	—	$	—	$	28	(a)
Derivative liabilities		(124	)		74			(50	)		—		—		(50	)
Net derivative assets/(liabilities)	$	(44	)	$	22		$	(22	)(a)	$	—	$	—	$	(22	)(a)
CECONY
Derivative assets	$	27		$	(18	)	$	9	(a)	$	—	$	—	$	9	(a)
Derivative liabilities		(58	)		33			(25	)		—		—		(25	)
Net derivative assets/(liabilities)	$	(31	)	$	15		$	(16	)(a)	$	—	$	—	$	(16	)(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 September 30, 2013 were:


*(Millions of Dollars)*	Fair Value of Commodity Derivatives(a) Balance Sheet Location	Con Edison			CECONY
Derivative Assets
Current	Other current assets	$	55		$	18
Long-term	Other deferred charges and noncurrent assets		25			9
Total derivative assets		$	80		$	27
Impact of netting			(18	)		(4	)
Net derivative assets		$	62		$	23
Derivative Liabilities
Current	Fair value of derivative liabilities	$	71		$	40
Long-term	Fair value of derivative liabilities		53			18
Total derivative liabilities		$	124		$	58
Impact of netting			(74	)		(33	)
Net derivative liabilities		$	50		$	25

(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 nine months ended September 30, 2013:


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Three Months Ended September 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	$	—		$	—
Long-term	Deferred derivative gains		—			—
Total deferred gains/(losses)		$	—		$	—
Current	Deferred derivative losses	$	11		$	9
Current	Recoverable energy costs		(19	)		(17	)
Long-term	Deferred derivative losses		6			7
Total deferred gains/(losses)		$	(2	)	$	(1	)
Net deferred gains/(losses)		$	(2	)	$	(1	)
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense	$	3	(b)	$	—
	Gas purchased for resale		(6	)		—
	Non-utility revenue		7			—
Total pre-tax gain/(loss) recognized in income		$	4		$	—

(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 September 30, 2013, Con Edison recorded in purchased power expense an unrealized pre-tax gain of $6 million.


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Nine Months Ended September 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		$ 1			$ 1
Long-term	Deferred derivative gains		—			—
Total deferred gains/(losses)			$ 1			$ 1
Current	Deferred derivative losses		$ 24			$ 19
Current	Recoverable energy costs		(22	)		(19	)
Long-term	Deferred derivative losses		3			7
Total deferred gains/(losses)			$ 5			$ 7
Net deferred gains/(losses)			$ 6			$ 8
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense		$ 32	(b)		$ —
	Gas purchased for resale		(17	)		—
	Non-utility revenue		8			—
Total pre-tax gain/(loss) recognized in income			$ 23			$ —

(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 nine months ended September 30, 2013, Con Edison recorded in purchased power expense an unrealized pre-tax gain of $22 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 nine months ended September 30, 2012:


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Three Months Ended September 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		$ 5			$ 5
Long-term	Deferred derivative gains		1			1
Total deferred gains/(losses)			$ 6			$ 6
Current	Deferred derivative losses		$ 51			$ 42
Current	Recoverable energy costs		(60	)		(52	)
Long-term	Deferred derivative losses		22			20
Total deferred gains/(losses)			$ 13			$ 10
Net deferred gains/(losses)			$ 19			$ 16
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense		$ 9	(b)		$ —
	Gas purchased for resale		—			—
	Non-utility revenue		1			—
Total pre-tax gain/(loss) recognized in income			$ 10			$ —

(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 September 30, 2012, Con Edison recorded in purchased power expense an unrealized pre-tax gain of $30 million.


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Nine Months Ended September 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		$ 5			$ 5
Long-term	Deferred derivative gains		1			1
Total deferred gains/(losses)			$ 6			$ 6
Current	Deferred derivative losses		$ 89			$ 78
Current	Recoverable energy costs		(187	)		(164	)
Long-term	Deferred derivative losses		13			19
Total deferred gains/(losses)			$ (85	)		$ (67	)
Net deferred gains/(losses)			$ (79	)		$ (61	)
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense		$ (49	)(b)		$ —
	Gas purchased for resale		(2	)		—
	Non-utility revenue		(11	)(b)		—
Total pre-tax gain/(loss) recognized in income			$ (62	)		$ —

(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 nine months ended September 30, 2012, Con Edison recorded in non-utility revenues and purchased power expense an unrealized pre-tax gain/(loss) of $(13) million and $75 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		470		13,643,994		83		11,625		634		79,090,035		1,187
CECONY		82		3,127,600		4		1,200		542		75,470,000		628

(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		$31			$25
Collateral posted		$ —			$ —
Additional collateral (b) (downgrade one level from current ratings)		$ —			$ —
Additional collateral (b) (downgrade to below investment grade from current ratings)		$42	(c)		$29	(c)

(a)

(b)

(c)	Derivative instruments that are net assets have been excluded from the table. At September 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 $37 million.

Interest Rate Swap

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

+ References

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+ Details

Fair Value Measurements

9 Months Ended

Sep. 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 September 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)	$	1	$	1	$	52	$	6	$	9	$	8	$	—	$	8	$	62	$	23
Other assets (c)(e)		129		122		108		98		—		—		—		—		237		220
Total	$	130	$	123	$	160	$	104	$	9	$	8	$	—	$	8	$	299	$	243
Derivative liabilities:
Commodity (a)(e)	$	9	$	9	$	74	$	37	$	23	$	—	$	(56)	$	(21)	$	50	$	25
Interest rate contract (b)(e)		—		—		3		—		—		—		—		—		3		—
Total	$	9	$	9	$	77	$	37	$	23	$	—	$	(56)	$	(21)	$	53	$	25

(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 nine months ended September 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 September 30, 2013 *(Millions of Dollars)*				Valuation Techniques	Unobservable Inputs	Range
Con Edison—Commodity
Electricity		$	(6	)	Discounted Cash Flow	Forward energy prices (a)	$24-$99 per MWH
Standard Offer Capacity Agreements			(17	)	Discounted Cash Flow	Forward capacity prices (a) Present value factor (a)	$119-$248 MW -day 2.64%
Transmission Congestion Contracts / Financial Transmission Rights			9		Discounted Cash Flow	Discount to adjust auction prices for inter-zonal forward price curves (b)	(5.8)%-42.4%
						Discount to adjust auction prices for historical monthly realized settlements (b)	(102.4)%-49.2%
						Inter-zonal forward price curves adjusted for historical zonal losses (b)	$1.56-$2.16
Total Con Edison—Commodity		$	(14	)
CECONY— Commodity
Transmission Congestion Contracts		$	8		Discounted Cash Flow	Discount to adjust auction prices for inter-zonal forward price curves (b)	(5.8)%-42.4%
						Discount to adjust auction prices for historical monthly realized settlements (b)	(102.4)%-49.2%

(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 September 30, 2013 and 2012 and classified as Level 3 in the fair value hierarchy:


	For Three Months Ended September 30, 2013
				Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of July 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 September 30, 2013
Con Edison
Derivatives:
Commodity	$	(6	)	$	(3	)	$	(2)	$	5	$	—	$	—	$	(8)	$	—	$	(14	)
CECONY
Derivatives:
Commodity	$	8		$	2		$	(1)	$	5	$	—	$	—	$	(6)	$	—	$	8


	For Nine Months Ended September 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 September 30, 2013
Con Edison
Derivatives:
Commodity	$	(5	)	$	5	$	1	$	12	$	—	$	—	$	(27)	$	—	$	(14	)
CECONY
Derivatives:
Commodity	$	10		$	9	$	—	$	10	$	—	$	—	$	(21)	$	—	$	8


	For the Three Months Ended September 30, 2012
			Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of July 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 September 30, 2012
Con Edison
Derivatives:
Commodity	$	(61)	$	(15)	$	19	$	7	$	—	$	—	$	25	$	22	$	(3	)
CECONY
Derivatives:
Commodity	$	(10)	$	(9)	$	8	$	7	$	—	$	—	$	5	$	11	$	12


	For the Nine Months Ended September 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 September 30, 2012
Con Edison
Derivatives:
Commodity	$	(62	)	$	(97	)	$	11	$	18	$	—	$	—	$	106	$	21		$	(3	)
Interest rate contract		(8	)		(1	)		—		—		—		—		1		8	(b)		—
Other assets(a)		99			3			3		—		—		—		—		(105	)(b)		—
Total	$	29		$	(95	)	$	14	$	18	$	—	$	—	$	107	$	(76	)	$	(3	)
CECONY
Derivatives:
Commodity	$	(7	)	$	(25	)	$	8	$	15	$	—	$	—	$	12	$	9	(b)	$	12
Other assets(a)		90			3			2		—		—		—		—		(95	)(b)		—
Total	$	83		$	(22	)	$	10	$	15	$	—	$	—	$	12	$	(86	)	$	12

(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 (immaterial and $2 million loss) and purchased power costs ($4 million loss and $2 million gain) on the consolidated income statement for the three months ended September 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 $11 million loss) and purchased power costs (immaterial and $42 million loss) on the consolidated income statement for the nine months ended September 30, 2013 and 2012, respectively. The change in fair value relating to Level 3 commodity derivative assets and liabilities held at September 30, 2013 and 2012 is included in non-utility revenues (immaterial and $2 million loss) and purchased power costs ($5 million loss and $16 million gain) on the consolidated income statement for the three months ended September 30, 2013 and 2012, respectively. For the nine months ended September 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 $11 million loss) and purchased power costs ($3 million loss and $40 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 September 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 September 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)	$	1	$	1	$	52	$	6	$	9	$	8	$	—	$	8	$	62	$	23
Other assets (c)(e)		129		122		108		98		—		—		—		—		237		220
Total	$	130	$	123	$	160	$	104	$	9	$	8	$	—	$	8	$	299	$	243
Derivative liabilities:
Commodity (a)(e)	$	9	$	9	$	74	$	37	$	23	$	—	$	(56)	$	(21)	$	50	$	25
Interest rate contract (b)(e)		—		—		3		—		—		—		—		—		3		—
Total	$	9	$	9	$	77	$	37	$	23	$	—	$	(56)	$	(21)	$	53	$	25

(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 nine months ended September 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 September 30, 2013 *(Millions of Dollars)*				Valuation Techniques	Unobservable Inputs	Range
Con Edison—Commodity
Electricity		$	(6	)	Discounted Cash Flow	Forward energy prices (a)	$24-$99 per MWH
Standard Offer Capacity Agreements			(17	)	Discounted Cash Flow	Forward capacity prices (a) Present value factor (a)	$119-$248 MW -day 2.64%
Transmission Congestion Contracts / Financial Transmission Rights			9		Discounted Cash Flow	Discount to adjust auction prices for inter-zonal forward price curves (b)	(5.8)%-42.4%
						Discount to adjust auction prices for historical monthly realized settlements (b)	(102.4)%-49.2%
						Inter-zonal forward price curves adjusted for historical zonal losses (b)	$1.56-$2.16
Total Con Edison—Commodity		$	(14	)
CECONY— Commodity
Transmission Congestion Contracts		$	8		Discounted Cash Flow	Discount to adjust auction prices for inter-zonal forward price curves (b)	(5.8)%-42.4%
						Discount to adjust auction prices for historical monthly realized settlements (b)	(102.4)%-49.2%

(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 September 30, 2013
				Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of July 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 September 30, 2013
Con Edison
Derivatives:
Commodity	$	(6	)	$	(3	)	$	(2)	$	5	$	—	$	—	$	(8)	$	—	$	(14	)
CECONY
Derivatives:
Commodity	$	8		$	2		$	(1)	$	5	$	—	$	—	$	(6)	$	—	$	8


	For Nine Months Ended September 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 September 30, 2013
Con Edison
Derivatives:
Commodity	$	(5	)	$	5	$	1	$	12	$	—	$	—	$	(27)	$	—	$	(14	)
CECONY
Derivatives:
Commodity	$	10		$	9	$	—	$	10	$	—	$	—	$	(21)	$	—	$	8


	For the Three Months Ended September 30, 2012
			Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of July 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 September 30, 2012
Con Edison
Derivatives:
Commodity	$	(61)	$	(15)	$	19	$	7	$	—	$	—	$	25	$	22	$	(3	)
CECONY
Derivatives:
Commodity	$	(10)	$	(9)	$	8	$	7	$	—	$	—	$	5	$	11	$	12


	For the Nine Months Ended September 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 September 30, 2012
Con Edison
Derivatives:
Commodity	$	(62	)	$	(97	)	$	11	$	18	$	—	$	—	$	106	$	21		$	(3	)
Interest rate contract		(8	)		(1	)		—		—		—		—		1		8	(b)		—
Other assets(a)		99			3			3		—		—		—		—		(105	)(b)		—
Total	$	29		$	(95	)	$	14	$	18	$	—	$	—	$	107	$	(76	)	$	(3	)
CECONY
Derivatives:
Commodity	$	(7	)	$	(25	)	$	8	$	15	$	—	$	—	$	12	$	9	(b)	$	12
Other assets(a)		90			3			2		—		—		—		—		(95	)(b)		—
Total	$	83		$	(22	)	$	10	$	15	$	—	$	—	$	12	$	(86	)	$	12

(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.

Variable Interest Entities	9 Months Ended
Variable Interest Entities	Sep. 30, 2013
Variable Interest Entities	Note M — Variable Interest Entities Con Edison has variable interests in Copper Mountain Solar 2 Holdings, LLC (CMS 2) and Mesquite Solar 1 Holdings, LLC (MS 1), non-consolidated entities in which Con Edison Development purchased a 50 percent membership interest in July and September 2013, respectively. CMS 2 owns a project company that is developing a 150 MW (AC) solar energy project (with 92 MW currently in service) in Nevada. MS 1 owns a project company that owns a 150 MW (AC) solar energy project in Arizona. Electricity generated by the projects is sold to Pacific Gas and Electric Company pursuant to long-term power purchase agreements. Con Edison is not the primary beneficiary of these variable interest entities since the power to direct the activities that most significantly impact the economics of CMS 2 and MS 1 is shared equally between Con Edison Development and a third party. At September 30, 2013, Con Edison’s consolidated balance sheet includes $76 million and $104 million in investments (including earnings) related to CMS 2 and MS 1, respectively, which assessed in accordance with the accounting rules for variable interest entities, is Con Edison’s current maximum exposure to loss in the entities. In addition, Con Edison and Con Edison Development have issued certain guarantees to third parties in connection with the CMS 2 and MS 1 projects. See “Guarantees” in Note H.
CECONY [Member]
Variable Interest Entities	Note M — Variable Interest Entities Con Edison has variable interests in Copper Mountain Solar 2 Holdings, LLC (CMS 2) and Mesquite Solar 1 Holdings, LLC (MS 1), non-consolidated entities in which Con Edison Development purchased a 50 percent membership interest in July and September 2013, respectively. CMS 2 owns a project company that is developing a 150 MW (AC) solar energy project (with 92 MW currently in service) in Nevada. MS 1 owns a project company that owns a 150 MW (AC) solar energy project in Arizona. Electricity generated by the projects is sold to Pacific Gas and Electric Company pursuant to long-term power purchase agreements. Con Edison is not the primary beneficiary of these variable interest entities since the power to direct the activities that most significantly impact the economics of CMS 2 and MS 1 is shared equally between Con Edison Development and a third party. At September 30, 2013, Con Edison’s consolidated balance sheet includes $76 million and $104 million in investments (including earnings) related to CMS 2 and MS 1, respectively, which assessed in accordance with the accounting rules for variable interest entities, is Con Edison’s current maximum exposure to loss in the entities. In addition, Con Edison and Con Edison Development have issued certain guarantees to third parties in connection with the CMS 2 and MS 1 projects. See “Guarantees” in Note H.

Asset Retirement Obligations

9 Months Ended

Sep. 30, 2013

Asset Retirement Obligations

Note N — 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 September 30, 2013 and December 31, 2012 were as follows:


	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Accrued liability — asset retirement obligations		$164		$159		$163		$158
Regulatory liabilities — allowance for cost of removal less salvage		$522		$503		$436		$420

CECONY [Member]

Asset Retirement Obligations

Note N — 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		$164		$159		$163		$158
Regulatory liabilities — allowance for cost of removal less salvage		$522		$503		$436		$420

New Financial Accounting Standards	9 Months Ended
New Financial Accounting Standards	Sep. 30, 2013
New Financial Accounting Standards	Note O — 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. In July 2013, the FASB issued ASU No. 2013-10, “Derivatives and Hedging (Topic 815): Inclusion of the Fed Funds Effective Swap Rate (or Overnight Index Swap Rate) as a Benchmark Interest Rate for Hedge Accounting Purposes (a consensus of the FASB Emerging Issues Task Force).” The new guidance permits designating the Federal Funds Effective Swap Rate as a benchmark interest rate for hedge accounting. Previously, only the U.S. Treasury and LIBOR rates were allowed under the hedge accounting rules in U.S. GAAP. The new guidance also eliminates the restriction on using different benchmark interest rates for similar hedges. The amendments are effective prospectively for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013. The application of this guidance does not have a material impact on the Companies’ financial position, results of operations and liquidity. In July 2013, the FASB issued ASU No. 2013-11, “Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit when a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (a Consensus of the FASB Emerging Issues Task Force).” The amendments require a liability related to an unrecognized tax benefit to be presented on a net basis with its associated deferred tax asset when utilization of such deferred tax assets is required or expected in the event the uncertain tax position is disallowed. Otherwise, the unrecognized tax benefit will be presented as a liability and will not be netted against deferred tax assets. For public entities, the amendments are effective prospectively for fiscal years, and interim periods within those years, beginning after December 15, 2013. The application of this guidance is not expected to have a material impact on the Companies’ financial position, results of operations and liquidity. See Note I.
CECONY [Member]
New Financial Accounting Standards	Note O — 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. In July 2013, the FASB issued ASU No. 2013-10, “Derivatives and Hedging (Topic 815): Inclusion of the Fed Funds Effective Swap Rate (or Overnight Index Swap Rate) as a Benchmark Interest Rate for Hedge Accounting Purposes (a consensus of the FASB Emerging Issues Task Force).” The new guidance permits designating the Federal Funds Effective Swap Rate as a benchmark interest rate for hedge accounting. Previously, only the U.S. Treasury and LIBOR rates were allowed under the hedge accounting rules in U.S. GAAP. The new guidance also eliminates the restriction on using different benchmark interest rates for similar hedges. The amendments are effective prospectively for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013. The application of this guidance does not have a material impact on the Companies’ financial position, results of operations and liquidity. In July 2013, the FASB issued ASU No. 2013-11, “Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit when a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (a Consensus of the FASB Emerging Issues Task Force).” The amendments require a liability related to an unrecognized tax benefit to be presented on a net basis with its associated deferred tax asset when utilization of such deferred tax assets is required or expected in the event the uncertain tax position is disallowed. Otherwise, the unrecognized tax benefit will be presented as a liability and will not be netted against deferred tax assets. For public entities, the amendments are effective prospectively for fiscal years, and interim periods within those years, beginning after December 15, 2013. The application of this guidance is not expected to have a material impact on the Companies’ financial position, results of operations and liquidity. See Note I.

Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2013

Accounting Policies [Abstract]

Earnings Per Common Share

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


	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
*(Millions of Dollars, except per share amounts/Shares in Millions)*	2013		2012		2013		2012
Net income for common stock	$	464	$	440	$	828	$	931
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		1.7		1.4		1.7
Adjusted weighted average common shares outstanding – diluted		294.3		294.6		294.3		294.6
Net income for common stock per common share – basic	$	1.58	$	1.50	$	2.83	$	3.18
Net income for common stock per common share – diluted	$	1.58	$	1.49	$	2.81	$	3.16

Changes in Accumulated Other Comprehensive Income by Component

For the three and nine months ended September 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, net of tax of $1 and $- for Con Edison and CECONY, respectively		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	)
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 September 30, 2013	$	2		$	—
Accumulated OCI, net of taxes, at September 30, 2013 (b)	$	(46	)	$	(9	)

(a)

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

- Definition

Tabular disclosure of the effect of income (loss) on an entity's diluted earnings per share.

+ References+ Details

Regulatory Matters (Tables)

9 Months Ended

Sep. 30, 2013

Text Block [Abstract]

Regulatory Assets and Liabilities

Regulatory Assets and Liabilities

Regulatory assets and liabilities at September 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		$5,011		$5,677		$4,779		$5,407
Future income tax		2,035		1,922		1,929		1,831
Environmental remediation costs		704		730		591		615
Deferred storm costs		451		432		340		309
Pension and other postretirement benefits deferrals		229		183		201		154
Revenue taxes		191		176		182		170
Surcharge for New York State assessment		119		73		113		68
Net electric deferrals		88		102		88		102
Unamortized loss on reacquired debt		67		74		64		70
Deferred derivative losses – long-term		34		40		13		20
O&R transition bond charges		34		39		—		—
Preferred stock redemption		28		29		28		29
Property tax reconciliation		20		16		—		—
Workers’ compensation		16		19		16		19
Other		163		193		153		178
Regulatory assets – long-term		9,190		9,705		8,497		8,972
Deferred derivative losses – current		45		69		42		60
Recoverable energy costs – current		1		5		—		—
Regulatory assets – current		46		74		42		60
Total Regulatory Assets		$9,236		$9,779		$8,539		$9,032
Regulatory liabilities
Allowance for cost of removal less salvage		$ 522		$ 503		$ 436		$ 420
Property tax reconciliation		290		187		290		187
Property tax refunds		130		7		129		6
Net unbilled revenue deferrals		104		136		104		136
Long-term interest rate reconciliation		94		62		94		62
World Trade Center settlement proceeds		62		62		62		62
Carrying charges on T&D net plant – electric and steam		30		31		20		13
Expenditure prudence proceeding		16		14		16		14
Other		309		200		280		177
Regulatory liabilities – long-term		1,557		1,202		1,431		1,077
Refundable energy costs – current		64		82		36		48
Revenue decoupling mechanism		51		72		49		68
Deferred derivative gains – current		2		—		1		—
Electric surcharge offset		—		29		—		29
Regulatory liabilities – current		117		183		86		145
Total Regulatory Liabilities		$1,674		$1,385		$1,517		$1,222

Capitalization (Tables)

9 Months Ended

Sep. 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)*	September 30, 2013				December 31, 2012
Long-Term Debt (including current portion)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Con Edison		$10,976		$12,213		$10,768		$12,935
CECONY		$ 9,841		$10,925		$ 9,845		$11,751

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

9 Months Ended

Sep. 30, 2013

Pension benefits [Member]

Companies' Net Periodic Benefit Costs

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


	For the Three Months Ended September 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	)		(176	)		(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			$ 199			$ 208			$ 185
Amortization of regulatory asset		1			—			1			—
TOTAL PERIODIC BENEFIT COST		$ 224			$ 199			$ 209			$ 185
Cost capitalized		(86	)		(64	)		(78	)		(60	)
Reconciliation to rate level		(31	)		—			(34	)		(1	)
Cost charged to operating expenses		$ 107			$ 135			$ 97			$ 124


	For the Nine Months Ended September 30,
	Con Edison						CECONY
*(Millions of Dollars)*	2013			2012			2013			2012
Service cost – including administrative expenses		$ 200			$ 177			$ 186			$ 165
Interest cost on projected benefit obligation		403			410			377			385
Expected return on plan assets		(563	)		(528	)		(534	)		(503	)
Recognition of net actuarial loss		624			531			591			503
Recognition of prior service costs		4			6			3			4
NET PERIODIC BENEFIT COST		$ 668			$ 596			$ 623			$ 554
Amortization of regulatory asset		2			1			2			1
TOTAL PERIODIC BENEFIT COST		$ 670			$ 597			$ 625			$ 555
Cost capitalized		(256	)		(200	)		(241	)		(186	)
Reconciliation to rate level		(55	)		(37	)		(56	)		(36	)
Cost charged to operating expenses		$ 359			$ 360			$ 328			$ 333

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

9 Months Ended

Sep. 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 nine months ended September 30, 2013 and 2012 were as follows:


	For the Three Months Ended September 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			16
Expected return on plan assets		(19	)		(21	)		(17	)		(19	)
Recognition of net actuarial loss		16			24			14			22
Recognition of prior service cost		(7	)		(5	)		(6	)		(4	)
NET PERIODIC POSTRETIREMENT BENEFIT COST		$ 9			$ 22			$ 8			$ 20
Cost capitalized		(3	)		(8	)		(3	)		(7	)
Reconciliation to rate level		14			3			12			3
Cost charged to operating expenses		$ 20			$ 17			$ 17			$ 16


	For the Nine Months Ended September 30,
	Con Edison						CECONY
*(Millions of Dollars)*	2013			2012			2013			2012
Service cost		$ 18			$ 20			$ 14			$ 15
Interest cost on accumulated other postretirement benefit obligation		40			55			34			48
Expected return on plan assets		(58	)		(64	)		(51	)		(56	)
Recognition of net actuarial loss		48			73			43			65
Recognition of prior service cost		(20	)		(16	)		(17	)		(13	)
Recognition of transition obligation		—			1			—			1
NET PERIODIC POSTRETIREMENT BENEFIT COST		$ 28			$ 69			$ 23			$ 60
Cost capitalized		(10	)		(24	)		(9	)		(20	)
Reconciliation to rate level		43			15			37			12
Cost charged to operating expenses		$ 61			$ 60			$ 51			$ 52

- Definition

Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans.

+ References+ Details

Environmental Matters (Tables)

9 Months Ended

Sep. 30, 2013

Environmental Remediation Obligations [Abstract]

Accrued Liabilities and Regulatory Assets

The accrued liabilities and regulatory assets related to Superfund Sites at September 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		$439		$462		$332		$351
Other Superfund Sites		73		83		71		82
Total		$512		$545		$403		$433
Regulatory assets		$704		$730		$591		$615

Environmental Remediation Costs

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


	For the Three Months Ended September 30,
	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Remediation costs incurred		$10		$3		$10		$1
Insurance recoveries received		—		—		—		—


	For the Nine Months Ended September 30,
	Con Edison				CECONY
*(Millions of Dollars)*	2013		2012		2013		2012
Remediation costs incurred		$35		$18		$30		$15
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 September 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		$91		$94		$86		$89
Regulatory assets – workers’ compensation		$16		$19		$16		$19

Other Material Contingencies (Tables)

9 Months Ended

Sep. 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 September 30, 2013			For the Nine Months Ended September 30, 2013
Increase/(decrease) to non-utility operating revenues	$	44		$	(27	)
(Increase)/decrease to other interest expense		—			(131	)
Income tax benefit/(expense)		(18	)		63
Total increase/(decrease) in net income	$	26		$	(95	)

Total Guarantees

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


Guarantee Type	0 – 3 years		4 – 10 years		> 10 years		Total
	*(Millions of Dollars)*
Energy transactions	$	705	$	52	$	25	$	782
Solar energy projects		443		—		4		447
Intra-company guarantees		16		—		—		16
Other guarantees		27		—		—		27
Total	$	1,191	$	52	$	29	$	1,272

Financial Information by Business Segment (Tables)

9 Months Ended

Sep. 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 September 30,
	Operating revenues				Inter-segment revenues						Depreciation and amortization				Operating income
*(Millions of Dollars)*	2013		2012		2013			2012			2013		2012		2013			2012
CECONY
Electric	$	2,622	$	2,611	$	4		$	4		$	188	$	179	$	811		$	812
Gas		199		189		1			1			33		31		(24	)		(21	)
Steam		72		68		22			20			16		15		(35	)		(37	)
Consolidation adjustments		—		—		(27	)		(25	)		—		—		—			—
Total CECONY	$	2,893	$	2,868	$	—		$	—		$	237	$	225	$	752		$	754
O&R
Electric	$	200	$	199	$	—		$	—		$	10	$	10	$	46		$	50
Gas		26		27		—			—			4		3		(7	)		(6	)
Total O&R	$	226	$	226	$	—		$	—		$	14	$	13	$	39		$	44
Competitive energy businesses	$	365	$	344	$	—		$	2		$	6	$	2	$	63		$	53
Other*		—		—		—			(2	)		1		—		1			—
Total Con Edison	$	3,484	$	3,438	$	—		$	—		$	258	$	240	$	855		$	851

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


	For the Nine Months Ended September 30,
	Operating revenues						Inter-segment revenues						Depreciation and amortization				Operating income
*(Millions of Dollars)*	2013			2012			2013			2012			2013		2012		2013		2012
CECONY
Electric	$	6,309		$	6,307		$	12		$	11		$	559	$	527	$	1,307	$	1,383
Gas		1,190			1,017			4			4			97		89		272		255
Steam		522			414			60			58			49		48		80		40
Consolidation adjustments		—			—			(76	)		(73	)		—		—		—		—
Total CECONY	$	8,021		$	7,738		$	—		$	—		$	705	$	664	$	1,659	$	1,678
O&R
Electric	$	492		$	457		$	—		$	—		$	31	$	28	$	81	$	74
Gas		143			144			—			—			11		11		20		26
Total O&R	$	635		$	601		$	—		$	—		$	42	$	39	$	101	$	100
Competitive energy businesses	$	834		$	954		$	4		$	6		$	16	$	6	$	7	$	111
Other*		(3	)		(6	)		(4	)		(6	)		1		—		—		(3	)
Total Con Edison	$	9,487		$	9,287		$	—		$	—		$	764	$	709	$	1,767	$	1,886

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

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References+ Details

Derivative Instruments and Hedging Activities (Tables)

9 Months Ended

Sep. 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 September 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	$	80		$	(52	)	$	28	(a)	$	—	$	—	$	28	(a)
Derivative liabilities		(124	)		74			(50	)		—		—		(50	)
Net derivative assets/(liabilities)	$	(44	)	$	22		$	(22	)(a)	$	—	$	—	$	(22	)(a)
CECONY
Derivative assets	$	27		$	(18	)	$	9	(a)	$	—	$	—	$	9	(a)
Derivative liabilities		(58	)		33			(25	)		—		—		(25	)
Net derivative assets/(liabilities)	$	(31	)	$	15		$	(16	)(a)	$	—	$	—	$	(16	)(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 September 30, 2013 were:


*(Millions of Dollars)*	Fair Value of Commodity Derivatives(a) Balance Sheet Location	Con Edison			CECONY
Derivative Assets
Current	Other current assets	$	55		$	18
Long-term	Other deferred charges and noncurrent assets		25			9
Total derivative assets		$	80		$	27
Impact of netting			(18	)		(4	)
Net derivative assets		$	62		$	23
Derivative Liabilities
Current	Fair value of derivative liabilities	$	71		$	40
Long-term	Fair value of derivative liabilities		53			18
Total derivative liabilities		$	124		$	58
Impact of netting			(74	)		(33	)
Net derivative liabilities		$	50		$	25

(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 nine months ended September 30, 2013:


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Three Months Ended September 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	$	—		$	—
Long-term	Deferred derivative gains		—			—
Total deferred gains/(losses)		$	—		$	—
Current	Deferred derivative losses	$	11		$	9
Current	Recoverable energy costs		(19	)		(17	)
Long-term	Deferred derivative losses		6			7
Total deferred gains/(losses)		$	(2	)	$	(1	)
Net deferred gains/(losses)		$	(2	)	$	(1	)
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense	$	3	(b)	$	—
	Gas purchased for resale		(6	)		—
	Non-utility revenue		7			—
Total pre-tax gain/(loss) recognized in income		$	4		$	—

(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 September 30, 2013, Con Edison recorded in purchased power expense an unrealized pre-tax gain of $6 million.


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Nine Months Ended September 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		$ 1			$ 1
Long-term	Deferred derivative gains		—			—
Total deferred gains/(losses)			$ 1			$ 1
Current	Deferred derivative losses		$ 24			$ 19
Current	Recoverable energy costs		(22	)		(19	)
Long-term	Deferred derivative losses		3			7
Total deferred gains/(losses)			$ 5			$ 7
Net deferred gains/(losses)			$ 6			$ 8
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense		$ 32	(b)		$ —
	Gas purchased for resale		(17	)		—
	Non-utility revenue		8			—
Total pre-tax gain/(loss) recognized in income			$ 23			$ —

(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 nine months ended September 30, 2013, Con Edison recorded in purchased power expense an unrealized pre-tax gain of $22 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 nine months ended September 30, 2012:


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Three Months Ended September 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		$ 5			$ 5
Long-term	Deferred derivative gains		1			1
Total deferred gains/(losses)			$ 6			$ 6
Current	Deferred derivative losses		$ 51			$ 42
Current	Recoverable energy costs		(60	)		(52	)
Long-term	Deferred derivative losses		22			20
Total deferred gains/(losses)			$ 13			$ 10
Net deferred gains/(losses)			$ 19			$ 16
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense		$ 9	(b)		$ —
	Gas purchased for resale		—			—
	Non-utility revenue		1			—
Total pre-tax gain/(loss) recognized in income			$ 10			$ —

(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 September 30, 2012, Con Edison recorded in purchased power expense an unrealized pre-tax gain of $30 million.


Realized and Unrealized Gains/(Losses) on Commodity Derivatives(a) Deferred or Recognized in Income for the Nine Months Ended September 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		$ 5			$ 5
Long-term	Deferred derivative gains		1			1
Total deferred gains/(losses)			$ 6			$ 6
Current	Deferred derivative losses		$ 89			$ 78
Current	Recoverable energy costs		(187	)		(164	)
Long-term	Deferred derivative losses		13			19
Total deferred gains/(losses)			$ (85	)		$ (67	)
Net deferred gains/(losses)			$ (79	)		$ (61	)
	Income Statement Location
Pre-tax gain/(loss) recognized in income
	Purchased power expense		$ (49	)(b)		$ —
	Gas purchased for resale		(2	)		—
	Non-utility revenue		(11	)(b)		—
Total pre-tax gain/(loss) recognized in income			$ (62	)		$ —

(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 nine months ended September 30, 2012, Con Edison recorded in non-utility revenues and purchased power expense an unrealized pre-tax gain/(loss) of $(13) million and $75 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		470		13,643,994		83		11,625		634		79,090,035		1,187
CECONY		82		3,127,600		4		1,200		542		75,470,000		628

(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		$31			$25
Collateral posted		$ —			$ —
Additional collateral (b) (downgrade one level from current ratings)		$ —			$ —
Additional collateral (b) (downgrade to below investment grade from current ratings)		$42	(c)		$29	(c)

(a)

(b)

(c)	Derivative instruments that are net assets have been excluded from the table. At September 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 $37 million.

- Definition

Tabular disclosure of credit derivatives which includes information by sellers of credit derivatives, about each credit derivative, or each group of similar credit derivatives, including (a) the nature of the credit derivative - its term, how it arose, the events or circumstances that would require the seller to perform under the credit derivative, and the current status of the payment/performance risk of the credit derivative; (b) the maximum potential amount of future payments (undiscounted) the seller could be required to make under the credit derivative; (c) the current fair value of the credit derivative; and (d) the nature of any recourse provisions under the credit derivative, and any assets held either as collateral or by third parties. A credit derivative is a derivative instrument (1) in which one or more of its underlyings are related to the credit risk of a specified entity (or a group of entities) or an index based on the credit risk of a group of entities and (2) that exposes the seller to potential loss from credit-risk-related events specified in the contract. Examples of credit derivatives within the scope of this paragraph include, but are not limited to, credit default swaps, credit spread options, and credit index products; also includes a hybrid instrument that has an embedded credit derivative (for example, but not limited to, a credit-linked note).

+ References+ Details

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References

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+ Details

Fair Value Measurements (Tables)

9 Months Ended

Sep. 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 September 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)	$	1	$	1	$	52	$	6	$	9	$	8	$	—	$	8	$	62	$	23
Other assets (c)(e)		129		122		108		98		—		—		—		—		237		220
Total	$	130	$	123	$	160	$	104	$	9	$	8	$	—	$	8	$	299	$	243
Derivative liabilities:
Commodity (a)(e)	$	9	$	9	$	74	$	37	$	23	$	—	$	(56)	$	(21)	$	50	$	25
Interest rate contract (b)(e)		—		—		3		—		—		—		—		—		3		—
Total	$	9	$	9	$	77	$	37	$	23	$	—	$	(56)	$	(21)	$	53	$	25

(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 nine months ended September 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 September 30, 2013 *(Millions of Dollars)*				Valuation Techniques	Unobservable Inputs	Range
Con Edison—Commodity
Electricity		$	(6	)	Discounted Cash Flow	Forward energy prices (a)	$24-$99 per MWH
Standard Offer Capacity Agreements			(17	)	Discounted Cash Flow	Forward capacity prices (a) Present value factor (a)	$119-$248 MW -day 2.64%
Transmission Congestion Contracts / Financial Transmission Rights			9		Discounted Cash Flow	Discount to adjust auction prices for inter-zonal forward price curves (b)	(5.8)%-42.4%
						Discount to adjust auction prices for historical monthly realized settlements (b)	(102.4)%-49.2%
						Inter-zonal forward price curves adjusted for historical zonal losses (b)	$1.56-$2.16
Total Con Edison—Commodity		$	(14	)
CECONY— Commodity
Transmission Congestion Contracts		$	8		Discounted Cash Flow	Discount to adjust auction prices for inter-zonal forward price curves (b)	(5.8)%-42.4%
						Discount to adjust auction prices for historical monthly realized settlements (b)	(102.4)%-49.2%

(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 September 30, 2013
				Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of July 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 September 30, 2013
Con Edison
Derivatives:
Commodity	$	(6	)	$	(3	)	$	(2)	$	5	$	—	$	—	$	(8)	$	—	$	(14	)
CECONY
Derivatives:
Commodity	$	8		$	2		$	(1)	$	5	$	—	$	—	$	(6)	$	—	$	8


	For Nine Months Ended September 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 September 30, 2013
Con Edison
Derivatives:
Commodity	$	(5	)	$	5	$	1	$	12	$	—	$	—	$	(27)	$	—	$	(14	)
CECONY
Derivatives:
Commodity	$	10		$	9	$	—	$	10	$	—	$	—	$	(21)	$	—	$	8


	For the Three Months Ended September 30, 2012
			Total Gains/(Losses)— Realized and Unrealized
*(Millions of Dollars)*	Beginning Balance as of July 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 September 30, 2012
Con Edison
Derivatives:
Commodity	$	(61)	$	(15)	$	19	$	7	$	—	$	—	$	25	$	22	$	(3	)
CECONY
Derivatives:
Commodity	$	(10)	$	(9)	$	8	$	7	$	—	$	—	$	5	$	11	$	12


	For the Nine Months Ended September 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 September 30, 2012
Con Edison
Derivatives:
Commodity	$	(62	)	$	(97	)	$	11	$	18	$	—	$	—	$	106	$	21		$	(3	)
Interest rate contract		(8	)		(1	)		—		—		—		—		1		8	(b)		—
Other assets(a)		99			3			3		—		—		—		—		(105	)(b)		—
Total	$	29		$	(95	)	$	14	$	18	$	—	$	—	$	107	$	(76	)	$	(3	)
CECONY
Derivatives:
Commodity	$	(7	)	$	(25	)	$	8	$	15	$	—	$	—	$	12	$	9	(b)	$	12
Other assets(a)		90			3			2		—		—		—		—		(95	)(b)		—
Total	$	83		$	(22	)	$	10	$	15	$	—	$	—	$	12	$	(86	)	$	12

(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)

9 Months Ended

Sep. 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		$164		$159		$163		$158
Regulatory liabilities — allowance for cost of removal less salvage		$522		$503		$436		$420

Summary of Significant Accounting Policies - Earnings Per Common Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended						9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Net income for common stock	$ 464	$ 172	$ 192	$ 440	$ 214	$ 277	$ 828	$ 931
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			1.7			1.4	1.7
Adjusted weighted average common shares outstanding - diluted	294.3			294.6			294.3	294.6
Net income for common stock per common share - basic	$ 1.58			$ 1.50			$ 2.83	$ 3.18
Net income for common stock per common share - diluted	$ 1.58			$ 1.49			$ 2.81	$ 3.16

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References+ Details

Summary of Significant Accounting Policies - Changes in Accumulated Other Comprehensive Income by Component (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated OCI, net of taxes	$ (48)	$ (50)	$ (53)		$ (53)
OCI before reclassifications, net of tax			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	2
TOTAL OTHER COMPREHENSIVE INCOME/(LOSS), NET OF TAXES	2	2	3	2	7	8
Accumulated OCI, net of taxes	(46)	(48)	(50)		(46)
CECONY [Member]
Accumulated OCI, net of taxes	(9)	(9)	(9)		(9)
OCI before reclassifications, net of tax
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)
Accumulated OCI, net of taxes	$ (9)	$ (9)	$ (9)		$ (9)

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References+ Details

Summary of Significant Accounting Policies - Changes in Accumulated Other Comprehensive Income by Component (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013
OCI before reclassifications, Tax			$ 1
Amounts reclassified from accumulated OCI related to pension plan liabilities, Tax	1	1	1
CECONY [Member]
OCI before reclassifications, Tax
Amounts reclassified from accumulated OCI related to pension plan liabilities, Tax

Regulatory Matters - Other Regulatory Matters - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended			9 Months Ended
	Sep. 30, 2013	Aug. 31, 2013	Jan. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Schedule Of Regulatory Assets And Liabilities [Line Items]
Revenues from electric				$ 249
Revenues from gas				32
Revenues from steam service				6
Potential refund to customers				1,318
Overcharges of construction expenditures				208
Refund amount	16			16
Regulatory asset	9,236			9,236	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	28			28
Capital expenditures				6
CECONY [Member]
Schedule Of Regulatory Assets And Liabilities [Line Items]
Electric rate increases	418		375
Gas rate increases	27		25
Steam rate decreases		10	5
Return on common equity	10.10%	8.70%	10.35%
Common equity ratio	50.00%	48.00%	50.00%
Electric rate decreases		146
Gas rate decreases		95
Steam rate increases	8
Response and restoration costs				471
Capital expenditures				143
Regulatory asset	8,539			8,539	9,032
O&R [Member]
Schedule Of Regulatory Assets And Liabilities [Line Items]
Response and restoration costs				92
Capital expenditures				$ 15

Regulatory Matters - Regulatory Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Regulatory Assets [Line Items]
Regulatory assets	$ 46	$ 74
Regulatory assets - long-term	9,190	9,705
Regulatory assets - current	46	74
Total Regulatory Assets	9,236	9,779
Regulatory liabilities	117	183
Regulatory liabilities - long-term	1,557	1,202
Regulatory liabilities - current	117	183
Total Regulatory Liabilities	1,674	1,385
Unrecognized Pension and Other Postretirement Costs [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	5,011	5,677
Future Income Tax [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	2,035	1,922
Environmental Remediation Costs [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	704	730
Deferred Storm Costs [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	451	432
Pension and Other Postretirement Benefits Deferrals [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	229	183
Revenue Taxes [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	191	176
Surcharge for New York State Assessment [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	119	73
Net Electric Deferrals [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	88	102
Unamortized Loss on Reacquired Debt [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	67	74
Deferred Derivative Losses - Long-Term [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	34	40
O&R Transition Bond Charges [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	34	39
Preferred Stock Redemption [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	28	29
Property Tax Reconciliation [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	20	16
Regulatory liabilities - long-term	290	187
Workers' compensation [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	16	19
Other [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	163	193
Deferred Derivative Losses - Current [Member]
Regulatory Assets [Line Items]
Regulatory assets	45	69
Regulatory assets - current	45	69
Recoverable Energy Costs - Current [Member]
Regulatory Assets [Line Items]
Regulatory assets	1	5
Regulatory assets - current	1	5
Allowance for Cost Removal Less Salvage [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	522	503
Property Tax Refunds [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	130	7
Net Unbilled Revenue Deferrals [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	104	136
Long-Term Interest Rate Reconciliation [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	94	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 Electric and Steam [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	30	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	309	200
Refundable Energy Costs - Current [Member]
Regulatory Assets [Line Items]
Regulatory liabilities	64	82
Regulatory liabilities - current	64	82
Revenue Decoupling Mechanism [Member]
Regulatory Assets [Line Items]
Regulatory liabilities	51	72
Regulatory liabilities - current	51	72
Deferred Derivative Gains - Current [Member]
Regulatory Assets [Line Items]
Regulatory liabilities	2
Regulatory liabilities - current	2
Electric Surcharge Offset [Member]
Regulatory Assets [Line Items]
Regulatory liabilities		29
Regulatory liabilities - current		29
CECONY [Member]
Regulatory Assets [Line Items]
Regulatory assets	42	60
Regulatory assets - long-term	8,497	8,972
Regulatory assets - current	42	60
Total Regulatory Assets	8,539	9,032
Regulatory liabilities	86	145
Regulatory liabilities - long-term	1,431	1,077
Regulatory liabilities - current	86	145
Total Regulatory Liabilities	1,517	1,222
CECONY [Member] \| Unrecognized Pension and Other Postretirement Costs [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	4,779	5,407
CECONY [Member] \| Future Income Tax [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	1,929	1,831
CECONY [Member] \| Environmental Remediation Costs [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	591	615
CECONY [Member] \| Deferred Storm Costs [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	340	309
CECONY [Member] \| Pension and Other Postretirement Benefits Deferrals [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	201	154
CECONY [Member] \| Revenue Taxes [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	182	170
CECONY [Member] \| Surcharge for New York State Assessment [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	113	68
CECONY [Member] \| Net Electric Deferrals [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	88	102
CECONY [Member] \| Unamortized Loss on Reacquired Debt [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	64	70
CECONY [Member] \| Deferred Derivative Losses - Long-Term [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	13	20
CECONY [Member] \| Preferred Stock Redemption [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	28	29
CECONY [Member] \| Property Tax Reconciliation [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	290	187
CECONY [Member] \| Workers' compensation [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	16	19
CECONY [Member] \| Other [Member]
Regulatory Assets [Line Items]
Regulatory assets - long-term	153	178
CECONY [Member] \| Deferred Derivative Losses - Current [Member]
Regulatory Assets [Line Items]
Regulatory assets	42	60
Regulatory assets - current	42	60
CECONY [Member] \| Allowance for Cost Removal Less Salvage [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	436	420
CECONY [Member] \| Property Tax Refunds [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	129	6
CECONY [Member] \| Net Unbilled Revenue Deferrals [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	104	136
CECONY [Member] \| Long-Term Interest Rate Reconciliation [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	94	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 Electric and Steam [Member]
Regulatory Assets [Line Items]
Regulatory liabilities - long-term	20	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	280	177
CECONY [Member] \| Refundable Energy Costs - Current [Member]
Regulatory Assets [Line Items]
Regulatory liabilities	36	48
Regulatory liabilities - current	36	48
CECONY [Member] \| Revenue Decoupling Mechanism [Member]
Regulatory Assets [Line Items]
Regulatory liabilities	49	68
Regulatory liabilities - current	49	68
CECONY [Member] \| Deferred Derivative Gains - Current [Member]
Regulatory Assets [Line Items]
Regulatory liabilities	1
Regulatory liabilities - current	1
CECONY [Member] \| Electric Surcharge Offset [Member]
Regulatory Assets [Line Items]
Regulatory liabilities		29
Regulatory liabilities - current		$ 29

Capitalization - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended					1 Months Ended					9 Months Ended
	Apr. 30, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Level 2 [Member]	Sep. 30, 2013 Level 3 [Member]	Jun. 30, 2013 CECONY [Member]	Feb. 28, 2013 CECONY [Member]	Sep. 30, 2013 CECONY [Member]	Dec. 31, 2012 CECONY [Member]	Sep. 30, 2013 CECONY [Member] Level 2 [Member]	Sep. 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		12,213	12,935	11,577	636			10,925	11,751	10,289	636
Tax - exempt debt											$ 636

Capitalization - Carrying Amounts and Fair Values of Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Carrying Amount	$ 10,976	$ 10,768
Fair Value	12,213	12,935
CECONY [Member]
Carrying Amount	9,841	9,845
Fair Value	$ 10,925	$ 11,751

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References+ Details

Short-Term Borrowing - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Short-term Debt [Line Items]
Commercial paper, outstanding	$ 1,220,000,000	$ 539,000,000
Weighted average interest rate	0.30%	0.30%
Loans outstanding under the credit agreement
Letters of credit outstanding under the credit agreement	29,000,000	131,000,000
Aggregate commitments under the credit agreement	2,100,000,000
Previously Reported [Member]
Short-term Debt [Line Items]
Credit agreement termination date	Oct. 31, 2016
Currently Reported [Member]
Short-term Debt [Line Items]
Credit agreement termination date	Oct. 31, 2017
CECONY [Member]
Short-term Debt [Line Items]
Commercial paper, outstanding	1,042,000,000	421,000,000
Weighted average interest rate	0.30%	0.30%
Letters of credit outstanding under the credit agreement	$ 11,000,000	$ 121,000,000

- Definition

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

+ References+ Details

Pension Benefits - Companies' Net Periodic Benefit Costs (Detail) (Pension benefits [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Service cost - including administrative expenses	$ 67	$ 59	$ 200	$ 177
Interest cost on projected benefit obligation	134	137	403	410
Expected return on plan assets	(187)	(176)	(563)	(528)
Recognition of net actuarial loss	208	177	624	531
Recognition of prior service costs	1	2	4	6
NET PERIODIC BENEFIT COST	223	199	668	596
Amortization of regulatory asset	1		2	1
TOTAL PERIODIC BENEFIT COST	224	199	670	597
Cost capitalized	(86)	(64)	(256)	(200)
Reconciliation to rate level	(31)		(55)	(37)
Cost charged to operating expenses	107	135	359	360
CECONY [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - including administrative expenses	62	55	186	165
Interest cost on projected benefit obligation	126	128	377	385
Expected return on plan assets	(178)	(168)	(534)	(503)
Recognition of net actuarial loss	197	168	591	503
Recognition of prior service costs	1	2	3	4
NET PERIODIC BENEFIT COST	208	185	623	554
Amortization of regulatory asset	1		2	1
TOTAL PERIODIC BENEFIT COST	209	185	625	555
Cost capitalized	(78)	(60)	(241)	(186)
Reconciliation to rate level	(34)	(1)	(56)	(36)
Cost charged to operating expenses	$ 97	$ 124	$ 328	$ 333

Pension Benefits - Additional Information (Detail) (Pension benefits [Member], USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Contributions	$ 867
Funds made to non-qualified supplemental plan	11
CECONY [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions	$ 810

Other Postretirement Benefits - Net Periodic Postretirement Benefit Costs (Detail) (Other Postretirement Benefits [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Schedule Of Other Postretirement Benefits [Line Items]
Service cost	$ 6	$ 6	$ 18	$ 20
Interest cost on accumulated other postretirement benefit obligation	13	18	40	55
Expected return on plan assets	(19)	(21)	(58)	(64)
Recognition of net actuarial loss	16	24	48	73
Recognition of prior service cost	(7)	(5)	(20)	(16)
Recognition of transition obligation				1
NET PERIODIC BENEFIT COST	9	22	28	69
Cost capitalized	(3)	(8)	(10)	(24)
Reconciliation to rate level	14	3	43	15
Cost charged to operating expenses	20	17	61	60
CECONY [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Service cost	5	5	14	15
Interest cost on accumulated other postretirement benefit obligation	12	16	34	48
Expected return on plan assets	(17)	(19)	(51)	(56)
Recognition of net actuarial loss	14	22	43	65
Recognition of prior service cost	(6)	(4)	(17)	(13)
Recognition of transition obligation				1
NET PERIODIC BENEFIT COST	8	20	23	60
Cost capitalized	(3)	(7)	(9)	(20)
Reconciliation to rate level	12	3	37	12
Cost charged to operating expenses	$ 17	$ 16	$ 51	$ 52

Other Postretirement Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Schedule Of Other Postretirement Benefits [Line Items]
Contributions	$ 887	$ 821
Other Postretirement Benefits [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Contributions	9
CECONY [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Contributions	830	761
CECONY [Member] \| Other Postretirement Benefits [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Contributions	$ 9

Environmental Matters - Accrued Liabilities and Regulatory Assets (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accrued Liabilities:
Regulatory assets	$ 9,236	$ 9,779
Manufactured gas plant sites [Member]
Accrued Liabilities:
Accrued Liabilities	439	462
Other Superfund Sites [Member]
Accrued Liabilities:
Accrued Liabilities	73	83
Superfund Sites [Member]
Accrued Liabilities:
Accrued Liabilities	512	545
Regulatory assets	704	730
CECONY [Member]
Accrued Liabilities:
Regulatory assets	8,539	9,032
CECONY [Member] \| Manufactured gas plant sites [Member]
Accrued Liabilities:
Accrued Liabilities	332	351
CECONY [Member] \| Other Superfund Sites [Member]
Accrued Liabilities:
Accrued Liabilities	71	82
CECONY [Member] \| Superfund Sites [Member]
Accrued Liabilities:
Accrued Liabilities	403	433
Regulatory assets	$ 591	$ 615

Environmental Matters - Environmental Remediation Costs (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accrued Environmental Remediation Costs [Line Items]
Remediation costs incurred	$ 10	$ 3	$ 35	$ 18
Insurance recoveries received
CECONY [Member]
Accrued Environmental Remediation Costs [Line Items]
Remediation costs incurred	10	1	30	15
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	Sep. 30, 2013	Dec. 31, 2012
Site Contingency [Line Items]
Regulatory assets	$ 9,236	$ 9,779
Asbestos suits [Member]
Site Contingency [Line Items]
Accrued liability	10	10
Regulatory assets	10	10
Workers Compensation Insurance [Member]
Site Contingency [Line Items]
Accrued liability	91	94
Regulatory assets	16	19
CECONY [Member]
Site Contingency [Line Items]
Regulatory assets	8,539	9,032
CECONY [Member] \| Asbestos suits [Member]
Site Contingency [Line Items]
Accrued liability	10	10
Regulatory assets	10	10
CECONY [Member] \| Workers Compensation Insurance [Member]
Site Contingency [Line Items]
Accrued liability	86	89
Regulatory assets	$ 16	$ 19

Other Material Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended			3 Months Ended							9 Months Ended
	Aug. 31, 2013	Jun. 30, 2013	Jan. 31, 2013	Mar. 31, 2013	Sep. 30, 2013 Lawsuits	Dec. 31, 2012	Sep. 30, 2013 Con Edison [Member]	Aug. 31, 2013 IRS [Member]	Jun. 30, 2013 IRS [Member]	Sep. 30, 2013 Insurance Receivables [Member]	Sep. 30, 2013 Tax deficiency paid in December 2005 [Member]	Sep. 30, 2013 Interest in April 2006 [Member]	Sep. 30, 2013 Leases [Member]	Sep. 30, 2013 Energy [Member]	Sep. 30, 2013 Solar Energy Projects [Member]	Sep. 30, 2013 Construction [Member]
Operating Leased Assets [Line Items]
Number of suits pending against the company					90
Estimated accrued liability for suits										$ 50
Insurance receivable for suits					50
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	26	29
Proceeds from the termination of a LILO transaction	92	108
The company's net investment in LILO transactions						(76)
Gross investment in LILO transactions						228
Deferred tax liabilities						304
Defray of interest charges relating to potential tax liability			447
Returned deposit from IRS					375	70		30	95
Guarantee obligations maximum exposure					1,272	859									80
Percentage of membership interest							50.00%
Guarantees issued													2	25		4
Maximum potential obligation					$ 5

Other Material Contingencies - Total Guarantees (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Guarantor Obligations [Line Items]
Total guarantees, by type and term	$ 1,272	$ 859
Energy transactions [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	782
Solar energy projects [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	447
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	27
0 - 3 years [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	1,191
0 - 3 years [Member] \| Energy transactions [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	705
0 - 3 years [Member] \| Solar energy projects [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	443
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	27
4 - 10 years [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	52
4 - 10 years [Member] \| Energy transactions [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	52
4 - 10 years [Member] \| Solar energy projects [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term
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	29
Greater than 10 years [Member] \| Energy transactions [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	25
Greater than 10 years [Member] \| Solar energy projects [Member]
Guarantor Obligations [Line Items]
Total guarantees, by type and term	4
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				9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Operating Loss Carryforwards [Line Items]
INCOME TAX EXPENSE	$ 250			$ 261	$ 373	$ 501
Effective tax rate	35.00%			37.00%	31.00%	35.00%
Estimated federal and state uncertain tax positions	8		72		8
Decrease in estimated prior year liabilities		238
Interest charges related to uncertain tax positions			126
Reduced interest expenses	5
Interest charges related to uncertain tax position, LILO transaction			131
Unrecognized tax benefits amount	5				5
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	222			227	431	436
Effective tax rate	36.00%			37.00%	34.00%	35.00%
Federal income tax benefits	7
Estimated federal and state uncertain tax positions			66
Reduced interest expenses	3		5
Con Edison [Member]
Operating Loss Carryforwards [Line Items]
INCOME TAX EXPENSE	$ 6				$ 6

Financial Information by Business Segment - Financial Data for Business Segments (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Operating revenues	$ 3,484	$ 3,438	$ 9,487	$ 9,287
Inter-segment revenues
Depreciation and amortization	258	240	764	709
Operating income	855	851	1,767	1,886
Competitive energy businesses [Member]
Segment Reporting Information [Line Items]
Operating revenues	365	344	834	954
Inter-segment revenues		2	4	6
Depreciation and amortization	6	2	16	6
Operating income	63	53	7	111
Other [Member]
Segment Reporting Information [Line Items]
Operating revenues			(3)	(6)
Inter-segment revenues		(2)	(4)	(6)
Depreciation and amortization	1		1
Operating income	1			(3)
CECONY [Member]
Segment Reporting Information [Line Items]
Operating revenues	2,893	2,868	8,021	7,738
Inter-segment revenues
Depreciation and amortization	237	225	705	664
Operating income	752	754	1,659	1,678
CECONY [Member] \| Operating Segments [Member] \| CECONY - Electric [Member]
Segment Reporting Information [Line Items]
Operating revenues	2,622	2,611	6,309	6,307
Inter-segment revenues	4	4	12	11
Depreciation and amortization	188	179	559	527
Operating income	811	812	1,307	1,383
CECONY [Member] \| Operating Segments [Member] \| CECONY - Gas [Member]
Segment Reporting Information [Line Items]
Operating revenues	199	189	1,190	1,017
Inter-segment revenues	1	1	4	4
Depreciation and amortization	33	31	97	89
Operating income	(24)	(21)	272	255
CECONY [Member] \| Operating Segments [Member] \| CECONY - Steam [Member]
Segment Reporting Information [Line Items]
Operating revenues	72	68	522	414
Inter-segment revenues	22	20	60	58
Depreciation and amortization	16	15	49	48
Operating income	(35)	(37)	80	40
CECONY [Member] \| Consolidation adjustments [Member]
Segment Reporting Information [Line Items]
Operating revenues
Inter-segment revenues	(27)	(25)	(76)	(73)
Depreciation and amortization
Operating income
O&R [Member]
Segment Reporting Information [Line Items]
Operating revenues	226	226	635	601
Inter-segment revenues
Depreciation and amortization	14	13	42	39
Operating income	39	44	101	100
O&R [Member] \| Operating Segments [Member] \| CECONY - Electric [Member]
Segment Reporting Information [Line Items]
Operating revenues	200	199	492	457
Inter-segment revenues
Depreciation and amortization	10	10	31	28
Operating income	46	50	81	74
O&R [Member] \| Operating Segments [Member] \| CECONY - Gas [Member]
Segment Reporting Information [Line Items]
Operating revenues	26	27	143	144
Inter-segment revenues
Depreciation and amortization	4	3	11	11
Operating income	$ (7)	$ (6)	$ 20	$ 26

Derivative Instruments and Hedging Activities - Fair Values of Commodity Derivatives Including Offsetting of Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/(Liabilities)	$ (44)	$ (90)
Gross Amounts Offset in the Statement of Financial Position	22	47
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	(22)	(43)
Net Amount	(22)	(43)
Derivative assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/(Liabilities)	80	86
Gross Amounts Offset in the Statement of Financial Position	(52)	(57)
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	28	29
Net Amount	28	29
Derivative liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/(Liabilities)	(124)	(176)
Gross Amounts Offset in the Statement of Financial Position	74	104
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	(50)	(72)
Net Amount	(50)	(72)
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
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
CECONY [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/(Liabilities)	(31)	(56)
Gross Amounts Offset in the Statement of Financial Position	15	29
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	(16)	(27)
Net Amount	(16)	(27)
CECONY [Member] \| Derivative assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets/(Liabilities)	27	27
Gross Amounts Offset in the Statement of Financial Position	(18)	(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)	(58)	(83)
Gross Amounts Offset in the Statement of Financial Position	33	44
Net Amounts of Assets/(Liabilities) Presented in the Statement of Financial Position	(25)	(39)
Net Amount	(25)	(39)
CECONY [Member] \| Financial instruments [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
CECONY [Member] \| Financial instruments [Member] \| Derivative assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
CECONY [Member] \| Financial instruments [Member] \| Derivative liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
CECONY [Member] \| Cash collateral received [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
CECONY [Member] \| Cash collateral received [Member] \| Derivative assets [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts Not Offset in the Statement of Financial Position
CECONY [Member] \| Cash collateral received [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	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Investment Holdings [Line Items]
Energy supply and hedging activities credit exposure total	$ 110	$ 110
Makeup of net credit exposure, with investment-grade counterparties	30	30
Makeup of net credit exposure with commodity exchange brokers	37	37
Makeup of net credit exposure independent system operators		42
Makeup of net credit exposure non-investment grade or non-rated counterparties		1
Number of Capacity Contracts		1,187
Interest Rate Swap [Member]
Investment Holdings [Line Items]
Derivative, fixed interest rate	6.09%	6.09%
Unrealized gain (loss) on derivatives		(3)
Increase in the fair value of derivative	1	3
CECONY [Member]
Investment Holdings [Line Items]
Energy supply and hedging activities credit exposure total	$ 14	$ 14
Number of Capacity Contracts		628

Derivative Instruments and Hedging Activities - Fair Values of Companies' Commodity Derivatives (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivatives Liabilities
Fair value of derivative liabilities	$ 124	$ 176
Impact of netting	(74)	(104)
Net derivatives liabilities	50	72
Derivatives Assets [Member]
Derivatives Assets
Fair value of derivative assets	80	86
Impact of netting	(18)	(20)
Net derivatives assets	62	66
Derivatives Assets [Member] \| Other current assets [Member]
Derivatives Assets
Fair value of derivative assets	55	64
Derivatives Assets [Member] \| Other deferred charges and noncurrent assets [Member]
Derivatives Assets
Fair value of derivative assets	25	22
Derivatives Liabilities [Member] \| Fair value of derivative liabilities, Current [Member]
Derivatives Liabilities
Fair value of derivative liabilities	71	122
Derivatives Liabilities [Member] \| Fair value of derivative liabilities, Long-term [Member]
Derivatives Liabilities
Fair value of derivative liabilities	53	54
CECONY [Member]
Derivatives Liabilities
Fair value of derivative liabilities	58	83
Impact of netting	(33)	(44)
Net derivatives liabilities	25	39
CECONY [Member] \| Derivatives Assets [Member]
Derivatives Assets
Fair value of derivative assets	27	27
Impact of netting	(4)	3
Net derivatives assets	23	30
CECONY [Member] \| Derivatives Assets [Member] \| Other current assets [Member]
Derivatives Assets
Fair value of derivative assets	18	18
CECONY [Member] \| Derivatives Assets [Member] \| Other deferred charges and noncurrent assets [Member]
Derivatives Assets
Fair value of derivative assets	9	9
CECONY [Member] \| Derivatives Liabilities [Member] \| Fair value of derivative liabilities, Current [Member]
Derivatives Liabilities
Fair value of derivative liabilities	40	58
CECONY [Member] \| Derivatives Liabilities [Member] \| Fair value of derivative liabilities, Long-term [Member]
Derivatives Liabilities
Fair value of derivative liabilities	$ 18	$ 25

- Definition

Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against an obligation to return collateral under a master netting arrangement.

+ References+ Details

- Definition

Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against a right to receive collateral under a master netting arrangement.

+ References+ Details

Derivative Instruments and Hedging Activities - Changes in Fair Values of Commodity Derivatives (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)		$ 6	$ 1	$ 6
Total deferred gains/(losses)	(2)	13	5	(85)
Net deferred gains/(losses)	(2)	19	6	(79)
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income	4	10	23	(62)
Deferred derivative gains, Current [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)		5	1	5
Regulatory liabilities, Long-term [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)		1		1
Deferred derivative losses, Current [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	11	51	24	89
Recoverable energy costs, Current [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(19)	(60)	(22)	(187)
Regulatory assets, Long-term [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	6	22	3	13
CECONY [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)		6	1	6
Total deferred gains/(losses)	(1)	10	7	(67)
Net deferred gains/(losses)	(1)	16	8	(61)
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)		5	1	5
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		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)	9	42	19	78
CECONY [Member] \| Recoverable energy costs, Current [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	(17)	(52)	(19)	(164)
CECONY [Member] \| Regulatory assets, Long-term [Member]
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Total deferred gains/(losses)	7	20	7	19
Purchased power expense [Member]
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income	3	9	32	(49)
Purchased power expense [Member] \| CECONY [Member]
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income
Gas purchased for resale [Member]
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income	(6)		(17)	(2)
Gas purchased for resale [Member] \| CECONY [Member]
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income
Non-utility revenue [Member]
Pre-tax gain/(loss) recognized in income
Total pre-tax gain/(loss) recognized in income	7	1	8	(11)
Non-utility revenue [Member] \| CECONY [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		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Purchased power expense [Member]
Derivatives, Fair Value [Line Items]
Unrealized gain/(loss) on derivatives	$ 6	$ 30	$ 22	$ 75
Non-utility revenue [Member]
Derivatives, Fair Value [Line Items]
Unrealized gain/(loss) on derivatives				$ (13)

Derivative Instruments and Hedging Activities - Number of Derivative Contracts by Commodity Type (Detail)	9 Months Ended
	Sep. 30, 2013 Contract
Derivatives, Fair Value [Line Items]
Number of Capacity Contracts	1,187
CECONY [Member]
Derivatives, Fair Value [Line Items]
Number of Capacity Contracts	628
Electric Derivatives [Member]
Derivatives, Fair Value [Line Items]
Number of Energy Contracts	470
MWHs	13,643,994
Number of Capacity Contracts	83
MWs	11,625
Electric Derivatives [Member] \| CECONY [Member]
Derivatives, Fair Value [Line Items]
Number of Energy Contracts	82
MWHs	3,127,600
Number of Capacity Contracts	4
MWs	1,200
Gas Derivatives [Member]
Derivatives, Fair Value [Line Items]
Number of Energy Contracts	634
Dths	79,090,035
Number of Capacity Contracts	1,187
Gas Derivatives [Member] \| CECONY [Member]
Derivatives, Fair Value [Line Items]
Number of Energy Contracts	542
Dths	75,470,000
Number of Capacity Contracts	628

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	Sep. 30, 2013
Derivatives, Fair Value [Line Items]
Aggregate fair value - net liabilities	$ 31
Collateral posted
Additional Collateral Required Due To Loss Of Unsecured Credit [Member]
Derivatives, Fair Value [Line Items]
Collateral posted	35
Additional collateral
Additional Collateral Aggregate Fair Value Down below Investment Grade [Member]
Derivatives, Fair Value [Line Items]
Collateral posted	37
Additional collateral	42
CECONY [Member]
Derivatives, Fair Value [Line Items]
Aggregate fair value - net liabilities	25
Collateral posted
CECONY [Member] \| Additional Collateral Required Due To Loss Of Unsecured Credit [Member]
Derivatives, Fair Value [Line Items]
Collateral posted	14
Additional collateral
CECONY [Member] \| Additional Collateral Aggregate Fair Value Down below Investment Grade [Member]
Derivatives, Fair Value [Line Items]
Additional collateral	$ 29

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	Sep. 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	35
Additional Collateral Aggregate Fair Value Down below Investment Grade [Member]
Derivatives, Fair Value [Line Items]
Collateral posted	37
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	$ 14

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Con Edison [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	$ 299	$ 279
Total liabilities	53	78
CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	243	227
Total liabilities	25	39
Commodity [Member] \| Con Edison [Member] \| Derivatives Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	62	66
Commodity [Member] \| Con Edison [Member] \| Derivatives Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	50	72
Commodity [Member] \| CECONY [Member] \| Derivatives Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	23	30
Commodity [Member] \| CECONY [Member] \| Derivatives Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	25	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	237	213
Other assets [Member] \| CECONY [Member] \| Derivatives Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	220	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	3	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	130	106
Total liabilities	9	12
Level 1 [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	123	99
Total liabilities	9	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	1
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	9	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	1
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	9	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	129	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	122	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	160	150
Total liabilities	77	122
Level 2 [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	104	106
Total liabilities	37	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	52	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	74	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	37	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	108	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	98	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	3	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	9	33
Total liabilities	23	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	9	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	23	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		(10)
Total liabilities	(56)	(94)
Netting Adjustments [Member] \| CECONY [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	8	12
Total liabilities	(21)	(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		(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	(56)	(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	8	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	(21)	(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

- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

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 $)	9 Months Ended
	Sep. 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	2.64%
Minimum [Member] \| Discount to Adjust Auction Prices for Inter-Zonal Forward Price Curves [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range in percentage	(5.80%)
Minimum [Member] \| Discount to Adjust Auction Prices for Historical Monthly Realized Settlements [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range in percentage	(102.40%)
Minimum [Member] \| Inter-Zonal Forward Price Curves and for Historical Zonal Losses [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range in percentage	1.56%
Unobservable Inputs Range	$ 1.56
Minimum [Member] \| Forward energy prices [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range	24
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	49.20%
Maximum [Member] \| Inter-Zonal Forward Price Curves and for Historical Zonal Losses [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range in percentage	2.16%
Unobservable Inputs Range	2.16
Maximum [Member] \| Forward energy prices [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range	99
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	(14,000,000)
Level 3 [Member] \| Electricity [Member]
Financial Instruments [Line Items]
Fair Value of commodity derivatives	(6,000,000)
Level 3 [Member] \| Standard Offer Capacity Agreements [Member]
Financial Instruments [Line Items]
Fair Value of commodity derivatives	(17,000,000)
Level 3 [Member] \| Transmission Congestion Contracts / Financial Transmission Rights [Member]
Financial Instruments [Line Items]
Fair Value of commodity derivatives	9,000,000
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	(5.80%)
CECONY [Member] \| Minimum [Member] \| Discount to Adjust Auction Prices for Historical Monthly Realized Settlements [Member]
Financial Instruments [Line Items]
Unobservable Inputs Range in percentage	(102.40%)
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	49.20%
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		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance				$ 29
Included in Earnings				(95)
Included in Regulatory Assets and Liabilities				14
Purchases				18
Issuances
Sales
Settlements				107
Transfer In/Out of Level 3				(76)
Ending Balance		(3)		(3)
Commodity [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	(6)	(61)	(5)	(62)
Included in Earnings	(3)	(15)	5	(97)
Included in Regulatory Assets and Liabilities	(2)	19	1	11
Purchases	5	7	12	18
Issuances
Sales
Settlements	(8)	25	(27)	106
Transfer In/Out of Level 3		22		21
Ending Balance	(14)	(3)	(14)	(3)
Interest rate contract [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance				(8)
Included in Earnings				(1)
Included in Regulatory Assets and Liabilities
Purchases
Issuances
Sales
Settlements				1
Transfer In/Out of Level 3				8
Ending Balance
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
Purchases
Issuances
Sales
Settlements
Transfer In/Out of Level 3				(105)
Ending Balance
CECONY [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance				83
Included in Earnings				(22)
Included in Regulatory Assets and Liabilities				10
Purchases				15
Issuances
Sales
Settlements				12
Transfer In/Out of Level 3				(86)
Ending Balance		12		12
CECONY [Member] \| Commodity [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	8	(10)	10	(7)
Included in Earnings	2	(9)	9	(25)
Included in Regulatory Assets and Liabilities	(1)	8		8
Purchases	5	7	10	15
Issuances
Sales
Settlements	(6)	5	(21)	12
Transfer In/Out of Level 3		11		9
Ending Balance	8	12	8	12
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
Purchases
Issuances
Sales
Settlements
Transfer In/Out of Level 3				(95)
Ending Balance

Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gain (loss) on Level 3 energy derivative assets				$ 95
Competitive energy businesses [Member] \| Other Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gain (loss) on Level 3 energy derivative assets			(2)
Gain (loss) on Level 3 energy derivative liabilities		(2)		(11)
Fair value, assets measured on recurring basis, change in unrealized gain (loss)		(2)	(2)	(11)
Competitive energy businesses [Member] \| Purchased power expense [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Gain (loss) on Level 3 energy derivative assets	(4)
Gain (loss) on Level 3 energy derivative liabilities		2		(42)
Fair value, assets measured on recurring basis, change in unrealized gain (loss)	$ (5)	$ 16	$ (3)	$ 40

Variable Interest Entities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended		9 Months Ended	1 Months Ended	9 Months Ended
	Jul. 31, 2013 CMS 2 [Member]	Sep. 30, 2013 CMS 2 [Member]	Sep. 30, 2013 CMS 2 [Member] NEVADA MW	Sep. 30, 2013 MS 1 [Member]	Sep. 30, 2013 MS 1 [Member] Arizona [Member] MW
Variable Interest Entity [Line Items]
Percentage of variable interests	50.00%			50.00%
Solar energy project			150		150
Solar energy in service			92
Investments including earnings		$ 76		$ 104

Asset Retirement Obligations - Accrued Liability for Asset Retirement Obligations and Regulatory Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Regulatory Liabilities [Line Items]
Accrued liability - asset retirement obligations	$ 164	$ 159
Regulatory liabilities - allowance for cost of removal less salvage	1,557	1,202
Allowance for Cost Removal Less Salvage [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities - allowance for cost of removal less salvage	522	503
CECONY [Member]
Regulatory Liabilities [Line Items]
Accrued liability - asset retirement obligations	163	158
Regulatory liabilities - allowance for cost of removal less salvage	1,431	1,077
CECONY [Member] \| Allowance for Cost Removal Less Salvage [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities - allowance for cost of removal less salvage	$ 436	$ 420

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Regulatory Assets [Abstract]
Reduction in net cash flow from financing activities instead of operating activities	$ 108

Other Material Contingencies - Schedule of Leveraged Lease Transactions Effect on Consolidated Income Statement (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Leveraged Lease [Line Items]
Total increase/(decrease) in net income	$ 26	$ (95)
Increase/(decrease) to non-utility operating revenues [Member]
Leveraged Lease [Line Items]
Total increase/(decrease) in net income	44	(27)
(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	$ (18)	$ 63

Derivative Instruments and Hedging Activities - Fair Values of Commodity Derivatives Including Offsetting of Assets and Liabilities (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Margin deposits	$ 34	$ 37
CECONY [Member]
Derivatives, Fair Value [Line Items]
Margin deposits	$ 14	$ 18