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Significant Accounting Policies - Amounts Due To Government Agencies (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Medicaid program:    
Minimum MLR and profit sharing $ 1,018 $ 1,016
Other 402 263
Medicare program:    
Risk adjustment and Part D risk sharing 68 89
Minimum MLR and profit sharing 115 101
Other 22 35
Marketplace program:    
Risk adjustment 1,037 902
Minimum MLR 7 18
Other 53 48
Total amounts due government agencies $ 2,722 $ 2,472