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Significant Accounting Policies - Quality Incentive Premium Revenue Recognized (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Schedule of Premium Revenue by Health Plan Type [Line Items]
Quality incentive premium revenue recognized as a percentage of total premium revenue	0.50%	0.60%
Select Health Plans
Schedule of Premium Revenue by Health Plan Type [Line Items]
Maximum available quality incentive premium - current period	$ 38	$ 40
Amount of quality incentive premium revenue recognized in current period: Earned current period	19	18
Amount of quality incentive premium revenue recognized in current period: Earned prior periods	5	5
Total amount of quality incentive premium revenue recognized in current period:	$ 24	$ 23
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%

X

- Definition

Amount of current year quality incentive premium revenue recognized.

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- Definition

Amount of quality incentive premium revenue recognized from prior year.

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- Definition

Maximum available quality incentive premium current year.

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- Definition

Percentage of additional incremental revenue earned.

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Quality Incentive Premium Revenue As A Percentage Of Total Revenue

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- Definition

Quality incentive premium revenue recognized.

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- Definition

Schedule of premium revenue by health plan type.

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