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Segments - Reconciliation of Gross Margin to Consolidated Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Add: Other operating revenues $ 27,771 $ 19,423 $ 16,829
Less: Other operating expenses (26,751) (18,345) (15,785)
Operating Income (Loss) 1,020 1,078 1,044
Less: other expenses, net 145 117 72
Income before income tax expense 875 961 972
Medicaid      
Segment Reporting Information [Line Items]      
Total margin 2,322 1,804 1,496
Add: Other operating revenues 21,231 15,217 13,026
Medicare      
Segment Reporting Information [Line Items]      
Total margin 430 351 331
Add: Other operating revenues 3,379 2,529 2,265
Marketplace Segment      
Segment Reporting Information [Line Items]      
Total margin 399 324 476
Add: Other operating revenues 3,091 1,677 1,538
Other      
Segment Reporting Information [Line Items]      
Total margin 14 0 0
Add: Other operating revenues 70 0 0
Operating Segments      
Segment Reporting Information [Line Items]      
Total margin 3,165 2,479 2,303
Other Operating      
Segment Reporting Information [Line Items]      
Add: Other operating revenues 846 1,124 621
Less: Other operating expenses $ (2,991) $ (2,525) $ (1,880)