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Related Party Transactions (Tables)
9 Months Ended
Sep. 30, 2021
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 September 30,Nine months ended September 30,
(In millions)2021202020212020
Revenues from Related Parties Included in Operating Revenues   
Gladstone$$$$
Ivanpah(a)
11 30 34 
Midway-Sunset
Total
$11 $13 $36 $40 
(a) Also includes fees under project management agreements with each project company