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Earnings Per Share (Tables)
 6 Months Ended
Jun. 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 June 30,Six months ended June 30,
(In millions, except per share data)2020201920202019
Basic income per share:
Net income available to common shareholders$313  $201  $434  $683  
Weighted average number of common shares outstanding - basic 245  265  246  272  
Income per weighted average common share — basic $1.28  $0.76  $1.76  $2.51  
Diluted income per share:
Net income available to common shareholders$313  $201  $434  $683  
Weighted average number of common shares outstanding - basic
245  265  246  272  
Incremental shares attributable to the issuance of equity compensation (treasury stock method)1  2  1  2  
Weighted average number of common shares outstanding - dilutive
246  267  247  274  
Income per weighted average common share — diluted$1.27  $0.75  $1.76  $2.49