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Capitalization (Carrying Amounts And Fair Values Of Long-term Debt) (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Consolidated Edison Inc
Carrying Amount	$ 11,071	$ 10,673
Fair Value	13,310	12,744
CECONY
Carrying Amount	10,144	9,745
Fair Value	$ 12,135	$ 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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