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Other Postretirement Benefits - Schedule of Expected Benefit Payments (Details) - Other Postretirement Benefits
$ in Millions
Dec. 31, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 84
2021 84
2022 84
2023 84
2024 84
2026-2030 409
CECONY  
Defined Benefit Plan Disclosure [Line Items]  
2020 76
2021 75
2022 75
2023 75
2024 75
2026-2030 $ 358