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Significant Accounting Policies - Amounts Due To Government Agencies (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Medicaid program:    
Minimum MLR and profit sharing $ 1,033 $ 1,016
Other 270 263
Medicare program:    
Risk adjustment and Part D risk sharing 105 89
Minimum MLR and profit sharing 103 101
Other 31 35
Marketplace program:    
Risk adjustment 949 902
Minimum MLR 20 18
Other 102 48
Total amounts due government agencies $ 2,613 $ 2,472