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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2021
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,
(In millions)202120202019
Revenues from Related Parties Included in Operating Revenues   
Gladstone$4 $4 $4 
Ivanpah(a)
39 43 35 
Midway-Sunset6 5 5 
Total
$49 $52 $44 
(a)Includes fees under project management agreements with each project company