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Medical Claims and Benefits Payable - Medical Claims and Future Benefits (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Other Liabilities Disclosure [Abstract]        
Fee-for-service claims incurred but not paid (IBNP) $ 1,681 $ 1,352    
Pharmacy payable 125 112    
Capitation payable 57 37    
Other 615 428    
Medical claims and benefits payable $ 2,478 $ 1,929 $ 1,871 $ 1,685