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Electricity Purchase Agreements - Summary of Estimated Capacity and Other Fixed Payments (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Long-term Contract for Purchase of Electric Power [Line Items]  
2022 $ 126
2023 78
2024 55
2025 55
2026 56
All Years Thereafter 434
CECONY  
Long-term Contract for Purchase of Electric Power [Line Items]  
2022 124
2023 78
2024 55
2025 55
2026 56
All Years Thereafter $ 434