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Electricity Purchase Agreements - Summary of Estimated Capacity and Other Fixed Payments (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Long-term Contract for Purchase of Electric Power [Line Items]  
2019 $ 206
2020 117
2021 65
2022 54
2023 55
All Years Thereafter 601
CECONY  
Long-term Contract for Purchase of Electric Power [Line Items]  
2019 202
2020 113
2021 64
2022 54
2023 55
All Years Thereafter $ 601