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Significant Accounting Policies - Quality Incentive Premium Revenue Recognized (Details) - USD ($) $ in Millions | 3 Months Ended
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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% |

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- Definition Amount of current year quality incentive premium revenue recognized. + References No definition available. + Details
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- Definition Amount of quality incentive premium revenue recognized from prior year. + References No definition available. + Details
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- Definition Quality incentive premium revenue recognized. + References No definition available. + Details
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