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Significant Accounting Policies - Due to Government Agencies (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Medicaid program: |  |
Medical cost floors and corridors | $ 103 | $ 135
Other amounts due to states | 81 | 71
Marketplace program: |  |
Risk adjustment | 466 | 917
Cost sharing reduction | 183 | 275
Other | 134 | 144
Amounts due government agencies | $ 967 | $ 1,542

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- Definition Medical Premium Liability Due to Agency + References No definition available. + Details
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