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Significant Accounting Policies - Amounts Due To Government Agencies (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Medicaid program:    
Minimum MLR and profit sharing $ 1,091 $ 1,016
Other 617 263
Medicare program:    
Minimum MLR and profit sharing 100 101
Risk adjustment and Part D risk sharing 74 89
Other 23 35
Marketplace program:    
Risk adjustment 179 902
Minimum MLR 4 18
Other 51 48
Total amounts due government agencies $ 2,139 $ 2,472