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Capitalization - Carrying Amounts and Fair Values of Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Carrying Amount	$ 10,959	$ 10,768
Fair Value	12,963	12,935
CECONY [Member]
Carrying Amount	10,040	9,845
Fair Value	$ 11,792	$ 11,751

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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