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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, 2019 | Mar. 31, 2018
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |
Maximum available quality incentive premium - current period | $ 45 | $ 40
Quality incentive premium revenue recognized in current period: |  |
Earned current period | 26 | 24
Earned prior periods | 20 | 11
Total | $ 46 | $ 35
Quality incentive premium revenue recognized as a percentage of total premium revenue | 1.20% | 0.80%
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 | 4.00% |

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- Definition Amount of current year quality incentive premium revenue recognized. + References No definition available. + Details
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- Definition Amount of quality incentive premium revenue recognized from prior year. + References No definition available. + Details
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