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Significant Accounting Policies - Quality Incentive Premium Revenue Recognized (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Schedule of Premium Revenue by Health Plan Type [Line Items]
Quality incentive premium revenue recognized as a percentage of total premium revenue	0.60%	0.50%	1.10%	0.50%
Select Health Plans
Schedule of Premium Revenue by Health Plan Type [Line Items]
Maximum available quality incentive premium - current period	$ 33	$ 28	$ 114	$ 86
Amount of quality incentive premium revenue recognized in current period: Earned current period	26	17	80	38
Amount of quality incentive premium revenue recognized in current period: Earned prior periods	0	0	54	11
Total amount of quality incentive premium revenue recognized in current period:	$ 26	$ 17	$ 134	$ 49
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%