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Significant Accounting Policies - Amounts Due To Government Agencies (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
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%