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Other Postretirement Benefits - Schedule of Expected Benefit Payments (Details) - Other Postretirement Benefits
$ in Millions
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 96
2021 95
2022 93
2023 92
2024 91
2025-2029 422
CECONY  
Defined Benefit Plan Disclosure [Line Items]  
2020 87
2021 85
2022 83
2023 82
2024 80
2025-2029 $ 368