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Medical Claims and Benefits Payable - Medical Claims and Future Benefits (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Other Liabilities Disclosure [Abstract]        
Fee-for-service claims incurred but not paid (IBNP) $ 1,609 $ 1,717    
Pharmacy payable 121 112    
Capitation payable 48 67    
Other 264 296    
Medical claims and benefits payable $ 2,042 $ 2,192 $ 2,478 $ 1,929