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Related Party Transactions (Tables)
12 Months Ended
Dec. 31, 2017
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, 2017, 2016 and 2015 were as follows:
 
CECONY
(Millions of Dollars)
2017
2016
2015
Cost of services provided
$111
$108
$99
Cost of services received
64
64
60