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Significant Accounting Policies - Quality Incentive Premium Revenue (Details) - State health plans with quality incentive programs - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Premium Revenue by Health Plan Type [Line Items] |  |  |
Maximum available quality incentive premium - current period | $ 147 | $ 118 | $ 90
Amount of quality incentive premium revenue recognized in current period - Earned current period | 104 | 66 | 40
Amount of quality incentive premium revenue recognized in current period - Earned prior periods | 47 | 13 | 4
Total quality incentive premium revenue recognized | $ 151 | $ 79 | $ 44
Quality incentive premium revenue recognized as a percentage of total premium revenue | 0.90% | 0.60% | 0.50%

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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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- Definition Maximum available quality incentive premium current year. + References No definition available. + Details
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- Definition Quality Incentive Premium Revenue As A Percentage Of Total Revenue + References No definition available. + Details
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- Definition Quality incentive premium revenue recognized. + References No definition available. + Details
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- Definition Schedule of premium revenue by health plan type. + References No definition available. + Details
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- Details
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