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Electricity Purchase Agreements - Summary of Estimated Capacity and Other Fixed Payments (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Long-term Contract for Purchase of Electric Power [Line Items]  
2018 $ 257
2019 202
2020 114
2021 65
2022 54
All Years Thereafter 656
CECONY  
Long-term Contract for Purchase of Electric Power [Line Items]  
2018 255
2019 198
2020 111
2021 64
2022 54
All Years Thereafter $ 656