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Significant Accounting Policies - Quality Incentive Premium Revenue Recognized (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |
Maximum available quality incentive premium - current period | $ 48 | $ 36 | $ 135 | $ 113
Quality incentive premium revenue recognized in current period: |  |  |  |
Earned current period | 39 | 24 | 97 | 72
Earned prior periods | 9 | 3 | 32 | 9
Total | $ 48 | $ 27 | $ 129 | $ 81
Quality incentive premium revenue recognized as a percentage of total premium revenue | 1.10% | 0.60% | 1.00% | 0.60%
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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