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Affordable Care Act (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Affordable Care Act [Abstract] |  |
Risk adjustment | $ (1,313) | $ (928)
Minimum MLR | (341) | (265)
Cost sharing reductions | $ 45 | $ (50)

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- Definition Affordable Care Act [Abstract] + References No definition available. + Details
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- Definition Affordable Care Act Cost Sharing Reductions + References No definition available. + Details
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- Definition Affordable Care Act Minimum Medical Loss Ratio + References No definition available. + Details
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- Definition Affordable Care Act Risk Adjustment + References No definition available. + Details
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