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Capitalization - Schedule of Long-Term Debt Maturities (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]  
2019 $ 650
2020 866
2021 1,260
2022 413
2023 293
CECONY  
Debt Instrument [Line Items]  
2019 475
2020 350
2021 640
2022 0
2023 $ 0