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Capitalization - Schedule of Long-Term Debt Maturities (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]  
2017 $ 39
2018 1,688
2019 574
2020 388
2021 540
CECONY  
Debt Instrument [Line Items]  
2017 0
2018 1,200
2019 475
2020 350
2021 $ 0