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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2018
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:
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(In millions)
Revenues from Related Parties Included in Operating Revenues
 
 
 
 
 
Gladstone
$
3

 
$
3

 
$
2

GenConn
4

 
5

 
5

Ivanpah
20

 
—

 
—

Midway-Sunset
5

 
—

 
—

Total
$
32

 
$
8

 
$
7