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Income Per Share (Tables)
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Reconciliation of NRG's basic and diluted (loss)/income per share
The reconciliation of NRG's basic and diluted income per share is shown in the following table:
Three months ended September 30,Nine months ended September 30,
(In millions, except per share data)2021202020212020
Basic income per share:
Net income$1,618 $249 $2,614 $683 
Weighted average number of common shares outstanding - basic 245 244 245 246 
Income per weighted average common share — basic $6.60 $1.02 $10.67 $2.78 
Diluted income per share:
Net income$1,618 $249 $2,614 $683 
Weighted average number of common shares outstanding - basic
245 244 245 246 
Incremental shares attributable to the issuance of equity compensation (treasury stock method)— 1 — 1 
Weighted average number of common shares outstanding - dilutive
245 245 245 247 
 Income per weighted average common share — diluted$6.60 $1.02 $10.67 $2.77