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Other Postretirement Benefits - Schedule of Expected Benefit Payments (Details) - Other Postretirement Benefits
$ in Millions
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 83
2019 81
2020 78
2021 76
2022 75
2023-2027 363
CECONY  
Defined Benefit Plan Disclosure [Line Items]  
2018 73
2019 70
2020 67
2021 65
2022 64
2023-2027 $ 303