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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2021
Related Party Transactions [Abstract]  
Summary of Costs of Administrative and Other Services Provided and Received The costs of administrative and other services provided by CECONY to, and received by it from, Con Edison and its other subsidiaries for the years ended December 31, 2021, 2020 and 2019 were as follows:
CECONY
(Millions of Dollars)202120202019
Cost of services provided$137$128$121
Cost of services received686664