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Significant Accounting Policies - Amounts Due To Government Agencies (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Medicaid program:    
Minimum MLR, corridors, and profit sharing $ 1,302 $ 1,145
Other premium adjustments 557 482
Medicare program:    
Minimum MLR and profit sharing 85 84
Risk adjustment and Part D risk sharing 61 76
Other premium adjustments 27 27
Marketplace program:    
Risk adjustment 278 230
Minimum MLR 1 2
Other premium adjustments 38 33
Total amounts due government agencies $ 2,349 $ 2,079