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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, 2020 | Mar. 31, 2019
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |
Maximum available quality incentive premium - current period | $ 61 | $ 45
Quality incentive premium revenue recognized in current period: |  |
Earned current period | 44 | 26
Earned prior periods | 12 | 20
Total | $ 56 | $ 46
Quality incentive premium revenue recognized as a percentage of total premium revenue | 1.30% | 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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- Definition Amount of quality incentive premium revenue recognized from prior year. + References No definition available. + Details
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- Details
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