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Significant Accounting Policies - 3R Program Receivables (Payables) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Accounting Policies [Abstract]    
Risk adjustment payable, Current Benefit Year $ (502)  
Risk adjustment payable, Prior Benefit Year (546)  
Risk adjustment payable, Total (1,048) $ (522)
Reinsurance receivable, Current Benefit Year 0  
Reinsurance receivable, Prior Benefit Year 57  
Reinsurance receivable, Total 57 55
Risk corridor payable, Current Benefit Year 0  
Risk corridor payable, Prior Benefit Year (1)  
Risk corridor payable, Total (1) (1)
Minimum MLR payable, Current Benefit Year (3)  
Minimum MLR payable, Prior Benefit Year (2)  
Minimum MLR payable, Total $ (5) $ (1)