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Medical Claims and Benefits Payable - Medical Claims and Future Benefits (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Other Liabilities Disclosure [Abstract]      
Fee-for-service claims incurred but not paid (IBNP) $ 1,333 $ 1,191  
Pharmacy payable 114 88  
Capitation payable 27 140  
Other 397 266  
Medical claims and benefits payable $ 1,871 $ 1,685 $ 1,201