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Capitalization - Schedule of Long-Term Debt Maturities (Detail)
$ in Millions
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]  
2016 $ 739
2017 16
2018 1,266
2019 552
2020 365
CECONY  
Debt Instrument [Line Items]  
2016 650
2017 0
2018 1,200
2019 475
2020 $ 350