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Segments - Reconciliation of Gross Margin to Consolidated Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Segment Reporting Information [Line Items]        
Add: other operating revenues $ 7,927 $ 7,040 $ 23,751 $ 20,362
Less: other operating expenses (7,592) (6,819) (22,683) (19,533)
Operating income 335 221 1,068 829
Other expenses, net 28 30 83 90
Income before income tax expense 307 191 985 739
Medicaid        
Segment Reporting Information [Line Items]        
Add: other operating revenues 6,380 5,354 19,091 15,583
Medicare        
Segment Reporting Information [Line Items]        
Add: other operating revenues 955 875 2,867 2,502
Marketplace        
Segment Reporting Information [Line Items]        
Add: other operating revenues 575 793 1,740 2,224
Other        
Segment Reporting Information [Line Items]        
Add: other operating revenues 17 18 53 53
Operating segments        
Segment Reporting Information [Line Items]        
Total margin 890 755 2,791 2,358
Operating segments | Medicaid        
Segment Reporting Information [Line Items]        
Total margin 703 532 2,168 1,687
Operating segments | Medicare        
Segment Reporting Information [Line Items]        
Total margin 108 151 360 329
Operating segments | Marketplace        
Segment Reporting Information [Line Items]        
Total margin 77 68 255 331
Operating segments | Other        
Segment Reporting Information [Line Items]        
Total margin 2 4 8 11
Other operating        
Segment Reporting Information [Line Items]        
Add: other operating revenues 274 222 732 620
Less: other operating expenses $ (829) $ (756) $ (2,455) $ (2,149)