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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019, 2018 and 2017 were as follows:
 
CECONY
(Millions of Dollars)
2019
2018
2017
Cost of services provided
$121
$115
$111
Cost of services received
64
73
64