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Significant Accounting Policies - Amounts Due To Government Agencies (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Amounts Due To Government Agencies, Medicaid Program [Abstract] |  |
Medical premiums liability, medical care costs threshold | $ 1,443 | $ 1,344
Percent due to medicare, medical loss ratio |  | 85.00%
Amounts due to medicare | $ 49 | $ 64
Percent due to medicare, medical loss ratio of marketplace |  | 80.00%

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