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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2020
Earnings Per Share [Abstract]  
Reconciliation of NRG's basic and diluted earnings 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)2020201920202019
Basic income per share:
Net income available to common shareholders$249 $372 $683 $1,055 
Weighted average number of common shares outstanding - basic 244 254 246 266 
Income per weighted average common share — basic $1.02 $1.46 $2.78 $3.97 
Diluted income per share:
Net income available to common shareholders$249 $372 $683 $1,055 
Weighted average number of common shares outstanding - basic
244 254 246 266 
Incremental shares attributable to the issuance of equity compensation (treasury stock method)1 2 1 2 
Weighted average number of common shares outstanding - dilutive
245 256 247 268 
Income per weighted average common share — diluted$1.02 $1.45 $2.77 $3.94