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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Computations of Basic and Diluted Earnings Per Share
We compute basic earnings per share using the weighted average number of common shares outstanding. We compute diluted earnings per share using the weighted average number of common shares outstanding plus the dilutive effect of outstanding stock options, SARs, RSUs and PSUs, computed using the treasury stock method.​​​​​​​​​​​​​​ During 2019, 2018 and 2017, we repurchased 7.949 million shares, 14.070 million shares and 25.092 million shares, respectively, of our common stock.
 
The following table sets forth the computations of basic and diluted earnings per share for the years ended December 31, 2019, 2018 and 2017 (dollars and shares in millions,
except
per share amounts):
 
2019
 
  
2018
 
  
2017
 
Net income attributable to HCA Healthcare, Inc.
 
$
3,505
 
   $
3,787
    $
2,216
 
                         
Weighted average common shares outstanding
 
 
341.210
 
    
347.297
     
362.305
 
Effect of dilutive incremental shares
 
 
7.016
 
    
8.006
     
9.916
 
                         
Shares used for diluted earnings per share
 
 
348.226
 
    
355.303
     
372.221
 
                         
Earnings per share:
 
 
 
    
     
 
Basic earnings per share
 
$
10.27
 
   $
10.90
    $
6.12
 
Diluted earnings per share
 
$
10.07
 
   $
10.66
    $
5.95