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Significant Accounting Policies - Amounts Due To Government Agencies (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Medicaid program:    
Minimum MLR and profit sharing $ 1,016 $ 513
Other 263 76
Medicare program:    
Risk adjustment and Part D risk sharing 89 45
Minimum MLR and profit sharing 101 62
Other 35 30
Marketplace program:    
Risk adjustment 902 326
Minimum MLR 18 37
Other 48 21
Magellan Complete Care acquisition opening balance 0 143
Total amounts due government agencies $ 2,472 $ 1,253