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Significant Accounting Policies - Amounts Due To Government Agencies (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Accounting Policies [Abstract] |  |
Medical cost floors and corridors | $ 98 | $ 103
Other amounts due to states | 90 | 81
Risk adjustment | 568 | 466
Cost sharing reduction | 0 | 183
Other | 176 | 134
Medical Premium Liability Due To Agency | $ 932 | $ 967

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