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Significant Accounting Policies - Quality Incentive Premium Revenue Recognized (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule of Premium Revenue by Health Plan Type [Line Items]
Maximum available quality incentive premium - current period	$ 40	$ 38
Quality incentive premium revenue recognized in current period:
Earned current period	24	19
Earned prior periods	11	5
Total	$ 35	$ 24
Quality incentive premium revenue recognized as a percentage of total premium revenue	0.80%	0.50%
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%

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- Definition

Amount of current year quality incentive premium revenue recognized.

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Amount of quality incentive premium revenue recognized from prior year.

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Maximum available quality incentive premium current year.

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Percentage of additional incremental revenue earned.

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Quality incentive premium revenue recognized.

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Quality Incentive Premium Revenue Recognized [Abstract]

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Schedule of premium revenue by health plan type.

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