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Electricity Purchase Agreements - Summary of Estimated Capacity and Other Fixed Payments (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Long-term Contract for Purchase of Electric Power [Line Items]  
2021 $ 141
2022 106
2023 68
2024 53
2025 54
All Years Thereafter 487
CECONY  
Long-term Contract for Purchase of Electric Power [Line Items]  
2021 138
2022 106
2023 68
2024 53
2025 54
All Years Thereafter $ 487