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Medical Claims and Benefits Payable - Components of the Change (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Balance at beginning of period $ 1,685 $ 1,201 $ 670
Components of medical care costs related to:      
Current period 14,966 11,935 8,123
Prior periods (192) (141) (46)
Total medical care costs 14,774 11,794 8,077
Change in non-risk provider payables 58 48 (32)
Payments for medical care costs related to:      
Current period 13,304 10,448 7,064
Prior periods 1,284 910 450
Total paid 14,588 11,358 7,514
Balance at end of period $ 1,929 $ 1,685 $ 1,201