Consolidated Income Statement (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
OPERATING REVENUES
Electric	$ 2,135	$ 2,237
Gas	732	882
Steam	375	341
Non-utility	374	329
TOTAL OPERATING REVENUES	3,616	3,789
OPERATING EXPENSES
Purchased power	884	963
Fuel	154	156
Gas purchased for resale	262	400
Other operations and maintenance	814	825
Depreciation and amortization	279	261
Taxes, other than income taxes	497	499
TOTAL OPERATING EXPENSES	2,890	3,104
OPERATING INCOME	726	685
OTHER INCOME (DEDUCTIONS)
Investment and other income	5	12
Allowance for equity funds used during construction	1	1
Other deductions	(2)	(3)
TOTAL OTHER INCOME	4	10
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	730	695
INTEREST EXPENSE
Interest on long-term debt	156	146
Other interest	6	(9)
Allowance for borrowed funds used during construction	(1)	(1)
NET INTEREST EXPENSE	161	136
INCOME BEFORE INCOME TAX EXPENSE	569	559
INCOME TAX EXPENSE	199	198
NET INCOME FOR COMMON STOCK	370	361
Net income for common stock per common share-basic	$ 1.26	$ 1.23
Net income for common stock per common share-diluted	$ 1.26	$ 1.23
DIVIDENDS DECLARED PER SHARE OF COMMON STOCK	$ 0.65	$ 0.63
AVERAGE NUMBER OF SHARES OUTSTANDING-BASIC (IN MILLIONS)	292.9	292.9
AVERAGE NUMBER OF SHARES OUTSTANDING-DILUTED (IN MILLIONS)	293.9	294.1
CECONY [Member]
OPERATING REVENUES
Electric	1,980	2,074
Gas	655	789
Steam	375	341
TOTAL OPERATING REVENUES	3,010	3,204
OPERATING EXPENSES
Purchased power	539	617
Fuel	154	156
Gas purchased for resale	198	346
Other operations and maintenance	703	725
Depreciation and amortization	257	240
Taxes, other than income taxes	475	477
TOTAL OPERATING EXPENSES	2,326	2,561
OPERATING INCOME	684	643
OTHER INCOME (DEDUCTIONS)
Investment and other income	2	7
Allowance for equity funds used during construction	1	1
Other deductions	(2)	(2)
TOTAL OTHER INCOME	1	6
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	685	649
INTEREST EXPENSE
Interest on long-term debt	141	128
Other interest	4	3
Allowance for borrowed funds used during construction
NET INTEREST EXPENSE	145	131
INCOME BEFORE INCOME TAX EXPENSE	540	518
INCOME TAX EXPENSE	192	184
NET INCOME FOR COMMON STOCK	$ 348	$ 334