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Income Tax - Schedule of Components of Income Tax (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax [Line Items]
State - Current	$ 59	$ 151	$ 29
State - Deferred	61	(70)	97
Federal - Current	(9)us-gaap_CurrentFederalTaxExpenseBenefit	285us-gaap_CurrentFederalTaxExpenseBenefit	(13)us-gaap_CurrentFederalTaxExpenseBenefit
Federal - Deferred	463	115	493
Amortization of investment tax credits	(6)us-gaap_InvestmentTaxCredit	(5)us-gaap_InvestmentTaxCredit	(6)us-gaap_InvestmentTaxCredit
Total income tax expense	568us-gaap_IncomeTaxExpenseBenefit	476us-gaap_IncomeTaxExpenseBenefit	600us-gaap_IncomeTaxExpenseBenefit
CECONY [Member]
Income Tax [Line Items]
State - Current	66	111	53
State - Deferred	65	(14)	53
Federal - Current	158	187	110
Federal - Deferred	271	241	318
Amortization of investment tax credits	(5)	(5)	(5)
Total income tax expense	$ 555	$ 520	$ 529

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.