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Significant Accounting Policies - Amounts Due To Government Agencies (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Medicaid program:    
Minimum MLR and profit sharing $ 513 $ 92
Other 76 95
Medicare program:    
Risk adjustment and Part D risk sharing 45 14
Minimum MLR and profit sharing 62 36
Other 30 21
Marketplace program:    
Risk adjustment 326 368
Minimum MLR 37 15
Other 21 23
Magellan Complete Care 143 0
Total amounts due government agencies $ 1,253 $ 664