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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, 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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