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Affordable Care Act (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Affordable Care Act [Abstract] |  |
Risk adjustment and reinsurance, pre-tax benefit, period increase (decrease) | $ 79 | $ 48
Risk adjustment | (928) | (677)
Reinsurance | 1 | 15
Risk corridor | 4 | 6
Minimum MLR | (265) | (22)
Cost sharing reductions | $ (50) | $ (96)

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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 Reinsurance + References No definition available. + Details
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- Definition Affordable Care Act Risk Adjustment + References No definition available. + Details
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- Definition Affordable Care Act Risk Adjustment and Reinsurance, Pre-Tax Benefit, Period Increase (Decrease) + References No definition available. + Details
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- Definition Affordable Care Act Risk Corridor + References No definition available. + Details
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