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Pension Benefits - Schedule of Employer Contribution to Defined Savings Plan (Details) - Defined Contribution Savings Plan - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Employer contribution to the defined savings plan $ 57 $ 57 $ 57
CECONY      
Defined Benefit Plan Disclosure [Line Items]      
Employer contribution to the defined savings plan $ 52 $ 51 $ 48