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Significant Accounting Policies - Amounts Due To Government Agencies (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Medicaid program: |  |
Medical cost floors and corridors | $ 95 | $ 103
Other amounts due to states | 69 | 81
Marketplace program: |  |
Risk adjustment | 285 | 466
Cost sharing reduction | 0 | 183
Other | 163 | 134
Total amounts due government agencies | $ 612 | $ 967

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