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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Schedule of Computations of Basic and Diluted Earnings Per Share The following table sets forth the computations of basic and diluted earnings per share for the years ended December 31, 2021, 2020 and 2019 (dollars and shares in millions, except per share amounts):
 
    
2021
     
2020
     
2019
  
Net income attributable to HCA Healthcare, Inc.
   
$
6,956
 
    $ 3,754      $ 3,505  
       
Weighted average common shares outstanding
   
 
323.315
 
      338.274        341.210  
Effect of dilutive incremental shares
   
 
5.437
 
      5.331        7.016  
    
 
 
     
 
 
     
 
 
  
Shares used for diluted earnings per share
   
 
328.752
 
      343.605        348.226  
    
 
 
     
 
 
     
 
 
  
Earnings per share:
                           
Basic earnings per share
   
$
21.52
 
    $ 11.10      $ 10.27  
Diluted earnings per share
   
$
21.16
 
    $ 10.93      $ 10.07