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Pension Benefits - Schedule of Expected Benefit Payments (Details) - Pension Benefits
$ in Millions
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 744
2021 756
2022 770
2023 788
2024 801
2025-2029 4,181
CECONY  
Defined Benefit Plan Disclosure [Line Items]  
2020 688
2021 699
2022 713
2023 728
2024 741
2025-2029 $ 3,883