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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2020
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, 2020, 2019 and 2018 were as follows:
CECONY
(Millions of Dollars)202020192018
Cost of services provided$128$121$115
Cost of services received666473