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Significant Accounting Policies - Amounts Due To Government Agencies (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Medicaid:    
Minimum MLR and profit sharing $ 774 $ 513
Other 208 76
Medicare:    
Risk adjustment and Part D risk sharing 88 45
Minimum MLR and profit sharing 136 62
Other 33 30
Marketplace:    
Risk adjustment 719 326
Minimum MLR 52 37
Other 62 21
Magellan Complete Care acquisition opening balance 0 143
Medical Premium Liability Due To Agency $ 2,072 $ 1,253