Consolidated Income Statement (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
OPERATING REVENUES
Electric	$ 2,237	$ 1,958
Gas	882	742
Steam	341	332
Non-utility	329	152
TOTAL OPERATING REVENUES	3,789	3,184
OPERATING EXPENSES
Purchased power	963	707
Fuel	156	147
Gas purchased for resale	400	250
Other operations and maintenance	825	830
Depreciation and amortization	261	251
Taxes, other than income taxes	499	473
TOTAL OPERATING EXPENSES	3,104	2,658
OPERATING INCOME	685	526
OTHER INCOME (DEDUCTIONS)
Investment and other income	12	4
Allowance for equity funds used during construction	1	1
Other deductions	(3)	(3)
TOTAL OTHER INCOME	10	2
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	695	528
INTEREST EXPENSE
Interest on long-term debt	146	143
Other interest	(9)	136
Allowance for borrowed funds used during construction	(1)
NET INTEREST EXPENSE	136	279
INCOME BEFORE INCOME TAX EXPENSE	559	249
INCOME TAX EXPENSE	198	57
NET INCOME FOR COMMON STOCK	361	192
Net income for common stock per common share-basic	$ 1.23	$ 0.66
Net income for common stock per common share-diluted	$ 1.23	$ 0.65
DIVIDENDS DECLARED PER SHARE OF COMMON STOCK	$ 0.630	$ 0.615
AVERAGE NUMBER OF SHARES OUTSTANDING-BASIC (IN MILLIONS)	292.9	292.9
AVERAGE NUMBER OF SHARES OUTSTANDING-DILUTED (IN MILLIONS)	294.1	294.2
CECONY [Member]
OPERATING REVENUES
Electric	2,074	1,814
Gas	789	660
Steam	341	332
TOTAL OPERATING REVENUES	3,204	2,806
OPERATING EXPENSES
Purchased power	617	455
Fuel	156	147
Gas purchased for resale	346	219
Other operations and maintenance	725	741
Depreciation and amortization	240	233
Taxes, other than income taxes	477	451
TOTAL OPERATING EXPENSES	2,561	2,246
OPERATING INCOME	643	560
OTHER INCOME (DEDUCTIONS)
Investment and other income	7	3
Allowance for equity funds used during construction	1
Other deductions	(2)	(2)
TOTAL OTHER INCOME	6	1
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE	649	561
INTEREST EXPENSE
Interest on long-term debt	128	127
Other interest	3	5
NET INTEREST EXPENSE	131	132
INCOME BEFORE INCOME TAX EXPENSE	518	429
INCOME TAX EXPENSE	184	152
NET INCOME FOR COMMON STOCK	$ 334	$ 277