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Significant Accounting Policies - 3R Program Receivables (Payables) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]    
Risk adjustment payable, Current Benefit Year $ (522)  
Risk adjustment payable, Prior Benefit Years 0  
Risk adjustment payable, Total (522) $ (214)
Reinsurance receivable, Current Benefit Year 51  
Reinsurance receivable, Prior Benefit Years 4  
Reinsurance receivable, Total 55 36
Risk corridor payable, Current Benefit Year (1)  
Risk corridor payable, Prior Benefit Years 0  
Risk corridor payable, Total (1) (10)
Minimum MLR payable, Current Benefit Year (1)  
Minimum MLR payable, Prior Benefit Years 0  
Minimum MLR payable, Total $ (1) $ (3)