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Pension Benefits - Schedule of Expected Benefit Payments (Details) - Pension Benefits
$ in Millions
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 728
2019 738
2020 753
2021 765
2022 778
2023-2027 4,083
CECONY  
Defined Benefit Plan Disclosure [Line Items]  
2018 677
2019 686
2020 700
2021 712
2022 724
2023-2027 $ 3,804