CONSOLIDATED INCOME STATEMENT (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
OPERATING REVENUES
Electric	$ 1,958	$ 1,862
Gas	742	645
Steam	332	263
Non-utility	152	308
TOTAL OPERATING REVENUES	3,184	3,078
OPERATING EXPENSES
Purchased power	707	781
Fuel	147	108
Gas purchased for resale	250	196
Other operations and maintenance	830	749
Depreciation and amortization	251	233
Taxes, other than income taxes	473	450
TOTAL OPERATING EXPENSES	2,658	2,517
OPERATING INCOME	526	561
OTHER INCOME (DEDUCTIONS)
Investment and other income	4	7
Allowance for equity funds used during construction	1
Other deductions	(3)	(4)
TOTAL OTHER INCOME (DEDUCTIONS)	2	3
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	528	564
INTEREST EXPENSE
Interest on long-term debt	143	145
Other interest	136	5
NET INTEREST EXPENSE	279	150
INCOME BEFORE INCOME TAX EXPENSE	249	414
INCOME TAX EXPENSE	57	134
NET INCOME	192	280
Preferred stock dividend requirements of subsidiary		(3)
Preferred stock dividend requirements		(3)
NET INCOME FOR COMMON STOCK	192	277
Net income for common stock per common share-basic	$ 0.66	$ 0.95
Net income for common stock per common share-diluted	$ 0.65	$ 0.94
DIVIDENDS DECLARED PER SHARE OF COMMON STOCK	$ 0.615	$ 0.605
AVERAGE NUMBER OF SHARES OUTSTANDING-BASIC (IN MILLIONS)	292.9	292.9
AVERAGE NUMBER OF SHARES OUTSTANDING-DILUTED (IN MILLIONS)	294.2	294.5
CECONY [Member]
OPERATING REVENUES
Electric	1,814	1,735
Gas	660	563
Steam	332	263
TOTAL OPERATING REVENUES	2,806	2,561
OPERATING EXPENSES
Purchased power	455	447
Fuel	147	108
Gas purchased for resale	219	169
Other operations and maintenance	741	645
Depreciation and amortization	233	218
Taxes, other than income taxes	451	430
TOTAL OPERATING EXPENSES	2,246	2,017
OPERATING INCOME	560	544
OTHER INCOME (DEDUCTIONS)
Investment and other income	3	5
Other deductions	(2)	(3)
TOTAL OTHER INCOME (DEDUCTIONS)	1	2
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	561	546
INTEREST EXPENSE
Interest on long-term debt	127	131
Other interest	5	5
NET INTEREST EXPENSE	132	136
INCOME BEFORE INCOME TAX EXPENSE	429	410
INCOME TAX EXPENSE	152	134
NET INCOME	277	276
Preferred stock dividend requirements		(3)
NET INCOME FOR COMMON STOCK	$ 277	$ 273