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Capitalization - Carrying Amounts And Fair Values Of Long-term Debt (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Consolidated Edison Inc [Member]
Carrying Amount	$ 10,769	$ 10,673
Fair Value	13,197	12,744
CECONY [Member]
Carrying Amount	9,845	9,745
Fair Value	$ 12,001	$ 11,593

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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