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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018, 2017 and 2016 were as follows:
 
CECONY
(Millions of Dollars)
2018
2017
2016
Cost of services provided
$115
$111
$108
Cost of services received
73
64
64