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Significant Accounting Policies - Amounts Due To Government Agencies (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Medicaid program:    
Minimum MLR, corridors, and profit sharing $ 1,145 $ 1,016
Other premium adjustments 482 263
Medicare program:    
Risk adjustment and Part D risk sharing 76 89
Minimum MLR and profit sharing 84 101
Other premium adjustments 27 35
Marketplace program:    
Risk adjustment 230 902
Minimum MLR 2 18
Other premium adjustments 33 48
Total amounts due government agencies $ 2,079 $ 2,472