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Significant Accounting Policies - Amounts Due To Government Agencies (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Medicaid program:    
Minimum MLR and profit sharing $ 85 $ 92
Other 105 95
Medicare program:    
Risk adjustment and Part D risk sharing 38 14
Minimum MLR and profit sharing 16 36
Other 24 21
Marketplace program:    
Risk adjustment 529 368
Minimum MLR 41 15
Other 27 23
Amounts due government agencies $ 865 $ 664