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Segments - Reconciliation of Gross Margin to Consolidated Income (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]        
Add: other operating revenues $ 8,054 $ 6,800 $ 15,824 $ 13,322
Less: other operating expenses (7,693) (6,527) (15,091) (12,714)
Operating income 361 273 733 608
Other expenses, net 27 30 55 60
Income before income tax expense 334 243 678 548
Medicaid        
Segment Reporting Information [Line Items]        
Add: other operating revenues 6,524 5,209 12,711 10,229
Medicare        
Segment Reporting Information [Line Items]        
Add: other operating revenues 963 822 1,912 1,627
Marketplace        
Segment Reporting Information [Line Items]        
Add: other operating revenues 549 751 1,165 1,431
Other        
Segment Reporting Information [Line Items]        
Add: other operating revenues 18 18 36 35
Operating segments        
Segment Reporting Information [Line Items]        
Total margin 930 767 1,901 1,603
Operating segments | Medicaid        
Segment Reporting Information [Line Items]        
Total margin 755 551 1,465 1,155
Operating segments | Medicare        
Segment Reporting Information [Line Items]        
Total margin 124 101 252 178
Operating segments | Marketplace        
Segment Reporting Information [Line Items]        
Total margin 48 112 178 263
Operating segments | Other        
Segment Reporting Information [Line Items]        
Total margin 3 3 6 7
Other operating        
Segment Reporting Information [Line Items]        
Add: other operating revenues 237 199 458 398
Less: other operating expenses $ (806) $ (693) $ (1,626) $ (1,393)