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Significant Accounting Policies - Quality Incentive Premium Revenue Recognized (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |
Maximum available quality incentive premium - current period | $ 47 | $ 39 | $ 87 | $ 77
Quality incentive premium revenue recognized in current period: |  |  |  |
Earned current period | 34 | 29 | 58 | 48
Earned prior periods | 12 | 1 | 23 | 6
Total | $ 46 | $ 30 | $ 81 | $ 54
Quality incentive premium revenue recognized as a percentage of total premium revenue | 1.00% | 0.60% | 0.90% | 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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