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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2013, 2012, and 2011 were as follows:

 

     CECONY  
(Millions of Dollars)   2013     2012     2011  

Cost of services provided

   $ 84      $ 83      $ 79   

Cost of services received

   $ 52      $ 49      $ 48