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Capitalization - Carrying Amounts and Fair Values of Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Carrying Amount	$ 11,129	$ 10,974
Fair Value	12,707	12,082
CECONY [Member]
Debt Instrument [Line Items]
Carrying Amount	10,216	9,841
Fair Value	$ 11,605	$ 10,797

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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