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Segments - Reconciliation of Gross Margin to Consolidated Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Segment Reporting Information [Line Items]        
Add: other operating revenues $ 8,327 $ 8,054 $ 16,476 $ 15,824
Less: other operating expenses (7,884) (7,693) (15,578) (15,091)
Operating income 443 361 898 733
Other expenses, net 27 27 55 55
Income before income tax expense 416 334 843 678
Medicaid        
Segment Reporting Information [Line Items]        
Add: other operating revenues 6,728 6,524 13,306 12,711
Medicare        
Segment Reporting Information [Line Items]        
Add: other operating revenues 1,055 963 2,111 1,912
Marketplace        
Segment Reporting Information [Line Items]        
Add: other operating revenues 524 549 1,021 1,165
Other        
Segment Reporting Information [Line Items]        
Add: other operating revenues 20 18 38 36
Operating segments        
Segment Reporting Information [Line Items]        
Total margin 1,007 930 2,023 1,901
Operating segments | Medicaid        
Segment Reporting Information [Line Items]        
Total margin 756 755 1,490 1,465
Operating segments | Medicare        
Segment Reporting Information [Line Items]        
Total margin 113 124 239 252
Operating segments | Marketplace        
Segment Reporting Information [Line Items]        
Total margin 135 48 289 178
Operating segments | Other        
Segment Reporting Information [Line Items]        
Total margin 3 3 5 6
Other operating        
Segment Reporting Information [Line Items]        
Add: other operating revenues 265 237 511 458
Less: other operating expenses $ (829) $ (806) $ (1,636) $ (1,626)