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Significant Accounting Policies - 3R Program Receivables (Payables) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Accounting Policies [Abstract]    
Risk adjustment payable, Current Benefit Year $ (655)  
Risk adjustment payable, Prior Benefit Year 0  
Risk adjustment payable, Total (655) $ (522)
Reinsurance receivable, Current Benefit Year 0  
Reinsurance receivable, Prior Benefit Year 10  
Reinsurance receivable, Total 10 55
Risk corridor payable, Current Benefit Year 0  
Risk corridor payable, Prior Benefit Year 0  
Risk corridor payable, Total 0 (1)
Minimum MLR payable, Current Benefit Year (27)  
Minimum MLR payable, Prior Benefit Year 0  
Minimum MLR payable, Total $ (27) $ (1)