Consolidated Income Statement (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
OPERATING REVENUES
Electric	$ 8,765	$ 8,866	$ 9,064
Gas	1,618	1,735	1,760
Steam	596	683	656
Non-utility	1,209	1,602	1,845
TOTAL OPERATING REVENUES	12,188	12,886	13,325
OPERATING EXPENSES
Purchased power	3,116	3,967	4,613
Fuel	310	412	458
Gas purchased for resale	461	622	683
Other operations and maintenance	3,182	2,969	2,888
Depreciation and amortization	955	884	840
Taxes, other than income taxes	1,825	1,793	1,723
TOTAL OPERATING EXPENSES	9,849	10,647	11,205
OPERATING INCOME	2,339	2,239	2,120
OTHER INCOME (DEDUCTIONS)
Investment and other income	18	23	46
Allowance for equity funds used during construction	4	11	15
Other deductions	(16)	(17)	(21)
TOTAL OTHER INCOME (DEDUCTIONS)	6	17	40
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	2,345	2,256	2,160
INTEREST EXPENSE
Interest on long-term debt	586	582	597
Other interest	20	18	21
Allowance for borrowed funds used during construction	(2)	(6)	(9)
NET INTEREST EXPENSE	604	594	609
INCOME BEFORE INCOME TAX EXPENSE	1,741	1,662	1,551
INCOME TAX EXPENSE	600	600	548
NET INCOME	1,141	1,062	1,003
Preferred stock dividend requirements of subsidiary	(3)	(11)	(11)
Preferred stock dividend requirements	(3)	(11)	(11)
NET INCOME FOR COMMON STOCK	1,138	1,051	992
Net income for common stock per common share - basic	$ 3.88	$ 3.59	$ 3.49
Net income for common stock per common share - diluted	$ 3.86	$ 3.57	$ 3.47
DIVIDENDS DECLARED PER SHARE OF COMMON STOCK	$ 2.42	$ 2.40	$ 2.38
AVERAGE NUMBER OF SHARES OUTSTANDING - BASIC (IN MILLIONS)	292.9	292.6	284.3
AVERAGE NUMBER OF SHARES OUTSTANDING - DILUTED (IN MILLIONS)	294.5	294.4	285.9
CECONY [Member]
OPERATING REVENUES
Electric	8,176	8,228	8,376
Gas	1,415	1,521	1,541
Steam	596	683	656
TOTAL OPERATING REVENUES	10,187	10,432	10,573
OPERATING EXPENSES
Purchased power	1,968	2,313	2,683
Fuel	310	412	458
Gas purchased for resale	387	518	574
Other operations and maintenance	2,788	2,561	2,493
Depreciation and amortization	894	829	787
Taxes, other than income taxes	1,747	1,716	1,656
TOTAL OPERATING EXPENSES	8,094	8,349	8,651
OPERATING INCOME	2,093	2,083	1,922
OTHER INCOME (DEDUCTIONS)
Investment and other income	9	4	32
Allowance for equity funds used during construction	2	8	13
Other deductions	(13)	(14)	(19)
TOTAL OTHER INCOME (DEDUCTIONS)	(2)	(2)	26
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	2,091	2,081	1,948
INTEREST EXPENSE
Interest on long-term debt	525	523	537
Other interest	22	16	19
Allowance for borrowed funds used during construction	(2)	(5)	(7)
NET INTEREST EXPENSE	545	534	549
INCOME BEFORE INCOME TAX EXPENSE	1,546	1,547	1,399
INCOME TAX EXPENSE	529	558	495
NET INCOME	1,017	989	904
Preferred stock dividend requirements	(3)	(11)	(11)
NET INCOME FOR COMMON STOCK	$ 1,014	$ 978	$ 893