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Related Party Transactions (Tables)
 6 Months Ended
Jun. 30, 2019
Related Party Transactions [Abstract]  
Summary of NRG's Material Related Party Transactions
The following table summarizes NRG's material related party transactions with third party affiliates:
 
Three months ended June 30,
 
Six months ended June 30,
 
2019
 
2018
 
2019
 
2018
 
(In millions)
 
 
Revenues from Related Parties Included in Operating Revenues
 
 
 
 
 
 
 
Gladstone
$
1

 
$
1

 
$
1

 
$
1

GenConn
—

 
1

 
—

 
3

Ivanpah
7

 
5

 
18

 
5

Midway-Sunset
1

 
—

 
2

 
—

Revenues from Related Parties recorded against selling, general and administrative expenses
 
 
 
 
 
 
 
GenOn
—

 
21

 
—

 
42

Total
$
9

 
$
28

 
$
21

 
$
51