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Segments - Schedule of Operating Segment Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Segment Reporting Information [Line Items]        
Revenues $ 8,054 $ 6,800 $ 15,824 $ 13,322
Medicaid        
Segment Reporting Information [Line Items]        
Revenues 6,524 5,209 12,711 10,229
Medicare        
Segment Reporting Information [Line Items]        
Revenues 963 822 1,912 1,627
Marketplace        
Segment Reporting Information [Line Items]        
Revenues 549 751 1,165 1,431
Other        
Segment Reporting Information [Line Items]        
Revenues $ 18 $ 18 $ 36 $ 35