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Significant Accounting Policies - Quality Incentive Premium Revenue Recognized (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Schedule of Premium Revenue by Health Plan Type [Line Items]        
Maximum available quality incentive premium - current period $ 39 $ 41 $ 77 $ 81
Quality incentive premium revenue recognized in current period:        
Earned current period 29 36 48 54
Earned prior periods 1 49 6 54
Total $ 30 $ 85 $ 54 $ 108
Quality incentive premium revenue recognized as a percentage of total premium revenue 0.60% 2.10% 0.60% 1.30%
Minimum | Select Health Plans        
Schedule of Premium Revenue by Health Plan Type [Line Items]        
Percentage of additional incremental revenue earned     1.00%  
Maximum | Select Health Plans        
Schedule of Premium Revenue by Health Plan Type [Line Items]        
Percentage of additional incremental revenue earned     3.00%