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Electricity Purchase Agreements - Summary of Estimated Capacity and Other Fixed Payments (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Long-term Contract for Purchase of Electric Power [Line Items]  
2020 $ 172
2021 101
2022 62
2023 57
2024 55
All Years Thereafter 546
CECONY  
Long-term Contract for Purchase of Electric Power [Line Items]  
2020 169
2021 99
2022 62
2023 57
2024 55
All Years Thereafter $ 546