Quarterly report pursuant to Section 13 or 15(d)

Fidelis Care Acquisition - Narrative (Details)

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Fidelis Care Acquisition - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 01, 2018
May 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Department of Health, State of New York            
Business Acquisition [Line Items]            
Undertakings to the State of New York $ 340          
Period contribution to be made 5 years          
Department of Health, State of New York | Selling, General and Administrative Expenses            
Business Acquisition [Line Items]            
Undertakings to the State of New York     $ 324   $ 324  
Registered Offering            
Business Acquisition [Line Items]            
Shares of stock sold in offering (in shares)   26.6        
Fidelis Care            
Business Acquisition [Line Items]            
Consideration transferred $ 3,470          
Revenues of acquiree since acquisition date     $ 2,797      
Total revenues       $ 14,387 $ 49,170 $ 42,954