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Capitalization - Schedule of Long-Term Debt Maturities (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]  
2018 $ 1,298
2019 578
2020 791
2021 544
2022 335
CECONY  
Debt Instrument [Line Items]  
2018 1,200
2019 475
2020 350
2021 0
2022 $ 0