Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 9 Months Ended
May 31, 2018
Apr. 30, 2018
Mar. 31, 2018
Sep. 30, 2018
Business Acquisition, Equity Interests Issued or Issuable [Line Items]        
Common stock issued       $ 2,779
MHM        
Business Acquisition, Equity Interests Issued or Issuable [Line Items]        
Shares issued in acquisition (in shares)   1.7    
Consideration transferred, common stock issued   $ 183    
Community Medical Holdings Corp        
Business Acquisition, Equity Interests Issued or Issuable [Line Items]        
Shares issued in acquisition (in shares)     1.4  
Consideration transferred, common stock issued     $ 149  
Interpreta        
Business Acquisition, Equity Interests Issued or Issuable [Line Items]        
Shares issued in acquisition (in shares)     1.7  
Consideration transferred, common stock issued     $ 175  
Percentage of ownership interests acquired     61.00%  
Registered Offering        
Business Acquisition, Equity Interests Issued or Issuable [Line Items]        
Shares of stock sold in offering (in shares) 26.6      
Common stock issued $ 2,860      
Net proceeds from the issuance of common stock $ 2,779      
Over-Allotment Option        
Business Acquisition, Equity Interests Issued or Issuable [Line Items]        
Option to purchase additional shares, percent 10.00%