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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2018
Apr. 30, 2018
Mar. 31, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]              
Preferred stock, shares authorized (in shares)         10,000,000 10,000,000  
Preferred stock, par value (in usd per share)         $ 0.001 $ 0.001  
Preferred stock, shares outstanding (in shares)         0 0  
Common stock, shares authorized to repurchase         16,000,000    
Remaining number of shares available to be repurchased         7,000,000    
Treasury stock, shares, acquired         1,000,000 1,000,000  
Payments for repurchase of common stock         $ 71 $ 65 $ 63
Common stock issued for stock offering         $ 2,779    
MHM Services              
Class of Stock [Line Items]              
Consideration transferred shares issued (in shares)   3,000,000          
Consideration transferred, common stock issued, value   $ 183          
Community Medical Holdings Corp              
Class of Stock [Line Items]              
Consideration transferred shares issued (in shares)       3,000,000      
Consideration transferred, common stock issued, value     $ 149        
Interpreta              
Class of Stock [Line Items]              
Consideration transferred shares issued (in shares)     3,000,000        
Consideration transferred, common stock issued, value     $ 175        
Percentage of voting interests acquired     61.00% 61.00%      
Public Stock Offering              
Class of Stock [Line Items]              
Shares issued in registered offering (in shares) 53,000,000            
Common stock issued for stock offering $ 2,860            
Net proceeds from sale of stock after underwriting discounts and commissions $ 2,779            
Over-Allotment Option              
Class of Stock [Line Items]              
Over allotment option to purchase additional shares, percentage 10.00%