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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2019
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)2019201820192018
Basic income per share attributable to NRG Energy, Inc;
Net income/(loss) attributable to NRG Energy, Inc. common stockholders$372  $(72) $1,055  $280  
Weighted average number of common shares outstanding - basic 254  299  266  309  
Income/(loss) per weighted average common share — basic $1.46  $(0.24) $3.97  $0.91  
Diluted income per share attributable to NRG Energy, Inc;
Net income/(loss) attributable to NRG Energy, Inc. available to common shareholders$372  $(72) $1,055  280  
Weighted average number of common shares outstanding - basic
254  299  266  309  
Incremental shares attributable to the issuance of equity compensation (treasury stock method) —    
Weighted average number of common shares outstanding - dilutive
256  299  268  313  
Income/(loss) per weighted average common share — diluted$1.45  $(0.24) $3.94  $0.89  
Summary of NRG's outstanding equity instruments that are anti-dilutive and were not included in the computation of the Company's diluted earnings per share
The following table summarizes NRG’s outstanding equity instruments that are anti-dilutive and were not included in the computation of the Company’s diluted income per share:
Three months ended September 30,Nine months ended September 30,
(In millions of shares)2019201820192018
Equity compensation plans—   —  —