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Capitalization - Carrying Amounts and Fair Values of Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Carrying Amount	$ 12,190us-gaap_LongTermDebt	$ 12,191us-gaap_LongTermDebt
Fair Value	14,224us-gaap_LongTermDebtFairValue	13,998us-gaap_LongTermDebtFairValue
CECONY [Member]
Debt Instrument [Line Items]
Carrying Amount	11,214	11,214
Fair Value	$ 13,066	$ 12,846

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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