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Significant Accounting Policies - Amounts Due To Government Agencies (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Medicaid program:    
Medical cost floors and corridors $ 74 $ 74
Other amounts due to states 76 84
Marketplace program:    
Risk adjustment 456 368
Other 171 138
Total amounts due government agencies $ 777 $ 664