Consolidated Income Statement (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
OPERATING REVENUES
Electric	$ 8,918	$ 9,064	$ 8,320
Gas	1,735	1,760	1,943
Steam	683	656	661
Non-utility	1,602	1,845	2,108
TOTAL OPERATING REVENUES	12,938	13,325	13,032
OPERATING EXPENSES
Purchased power	3,967	4,613	4,776
Fuel	412	458	503
Gas purchased for resale	622	683	963
Other operations and maintenance	2,969	2,888	2,555
Depreciation and amortization	884	840	791
Taxes, other than income taxes	1,845	1,723	1,545
TOTAL OPERATING EXPENSES	10,699	11,205	11,133
OPERATING INCOME	2,239	2,120	1,899
OTHER INCOME (DEDUCTIONS)
Investment and other income	23	46	32
Allowance for equity funds used during construction	11	15	14
Other deductions	(17)	(21)	(15)
TOTAL OTHER INCOME (DEDUCTIONS)	17	40	31
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	2,256	2,160	1,930
INTEREST EXPENSE
Interest on long-term debt	582	597	590
Other interest	18	21	30
Allowance for borrowed funds used during construction	(6)	(9)	(9)
NET INTEREST EXPENSE	594	609	611
INCOME BEFORE INCOME TAX EXPENSE	1,662	1,551	1,319
INCOME TAX EXPENSE	600	548	440
NET INCOME	1,062	1,003	879
Preferred stock dividend requirements of subsidiary	(11)	(11)	(11)
NET INCOME FOR COMMON STOCK	1,051	992	868
Net income for common stock per common share - basic	$ 3.59	$ 3.49	$ 3.16
Net income for common stock per common share - diluted	$ 3.57	$ 3.47	$ 3.14
DIVIDENDS DECLARED PER SHARE OF COMMON STOCK	$ 2.40	$ 2.38	$ 2.36
AVERAGE NUMBER OF SHARES OUTSTANDING - BASIC (IN MILLIONS)	292.6	284.3	275.2
AVERAGE NUMBER OF SHARES OUTSTANDING - DILUTED (IN MILLIONS)	294.4	285.9	276.3
CECONY [Member]
OPERATING REVENUES
Electric	8,280	8,376	7,674
Gas	1,521	1,541	1,701
Steam	683	656	661
TOTAL OPERATING REVENUES	10,484	10,573	10,036
OPERATING EXPENSES
Purchased power	2,313	2,683	2,583
Fuel	412	458	503
Gas purchased for resale	518	574	818
Other operations and maintenance	2,561	2,493	2,186
Depreciation and amortization	829	787	744
Taxes, other than income taxes	1,768	1,656	1,486
TOTAL OPERATING EXPENSES	8,401	8,651	8,320
OPERATING INCOME	2,083	1,922	1,716
OTHER INCOME (DEDUCTIONS)
Investment and other income	4	32	34
Allowance for equity funds used during construction	8	13	12
Other deductions	(14)	(19)	(13)
TOTAL OTHER INCOME (DEDUCTIONS)	(2)	26	33
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	2,081	1,948	1,749
INTEREST EXPENSE
Interest on long-term debt	523	537	534
Other interest	16	19	27
Allowance for borrowed funds used during construction	(5)	(7)	(8)
NET INTEREST EXPENSE	534	549	553
INCOME BEFORE INCOME TAX EXPENSE	1,547	1,399	1,196
NET INCOME	989	904	792
Preferred stock dividend requirements of subsidiary	(11)	(11)	(11)
NET INCOME FOR COMMON STOCK	$ 978	$ 893	$ 781