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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2016
Related Party Transactions [Abstract]  
Summary of NRG's material related-party transactions with affiliates
The following table summarizes NRG's material related party transactions with third party affiliates that are included in the Company's operating revenues, operating costs and other income and expense:
 
Year Ended December 31,
 
2016
 
2015
 
2014
 
(In millions)
Revenues from Related Parties Included in Operating Revenues
 
 
 
 
 
Gladstone
$
2

 
$
4

 
$
6

GenConn
5

 
4

 
6

Total
$
7

 
$
8

 
$
12