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Significant Accounting Policies - Quality Incentive Premium Revenue Recognized (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |
Maximum available quality incentive premium - current period | $ 65 | $ 46 | $ 126 | $ 91
Quality incentive premium revenue recognized in current period: |  |  |  |
Earned current period | 58 | 37 | 102 | 63
Earned prior periods | 7 | 10 | 19 | 30
Total | $ 65 | $ 47 | $ 121 | $ 93
Quality incentive premium revenue recognized as a percentage of total premium revenue | 1.50% | 1.20% | 1.40% | 1.20%
Select health plans | Minimum |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |
Percentage of additional incremental revenue earned |  |  | 1.00% |
Select health plans | Maximum |  |  |  |
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |  |
Percentage of additional incremental revenue earned |  |  | 4.00% |

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