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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Employer contribution to the defined savings plan $ 45 $ 40 $ 36
CECONY      
Defined Benefit Plan Disclosure [Line Items]      
Employer contribution to the defined savings plan $ 39 $ 35 $ 32