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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Reconciliation of NRG's basic and diluted earnings per share
The reconciliation of NRG's basic income/(loss) per share to diluted income/(loss) per share is shown in the following table:
 Year Ended December 31,
 (In millions, except per share amounts)202020192018
Basic income per share attributable to NRG, Inc;    
Net income attributable to NRG Energy, Inc. common stockholders$510 $4,438 $268 
Weighted average number of common shares outstanding-basic245 262 304 
Income per weighted average common share — basic$2.08 $16.94 $0.88 
Diluted income per share attributable to NRG, Inc;
Net income attributable to NRG Energy, Inc. common stockholders$510 $4,438 $268 
Weighted average number of common shares outstanding-basic245 262 304 
  Incremental shares attributable to the issuance of equity compensation (treasury stock method)
1 2 4 
Weighted average number of common shares outstanding-diluted246 264 308 
Income per weighted average common share — diluted$2.07 $16.81 $0.87