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Medical Claims Liability - Schedule of Change in Medical Claims Liability (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Beginning balance $ 20,544 $ 18,308
Less: Reinsurance recoverable 76 65
Beginning balance 20,468 18,243
Incurred related to:    
Current year 39,497 37,458
Prior years (1,194) (1,133)
Total incurred 38,303 36,325
Paid related to:    
Current year 25,368 23,329
Prior years 12,858 11,570
Total paid 38,226 34,899
Plus: Premium deficiency reserve   178
Ending balance 20,545 19,847
Plus: Reinsurance recoverable 82 64
Ending balance 20,627 19,911
Medicaid    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Beginning balance 10,375 10,299
Less: Reinsurance recoverable 16 18
Beginning balance 10,359 10,281
Incurred related to:    
Current year 22,608 21,419
Prior years (653) (576)
Total incurred 21,955 20,843
Paid related to:    
Current year 14,092 12,996
Prior years 6,820 6,849
Total paid 20,912 19,845
Plus: Premium deficiency reserve   0
Ending balance 11,402 11,279
Plus: Reinsurance recoverable 14 18
Ending balance 11,416 11,297
Medicare    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Beginning balance 4,401 3,358
Less: Reinsurance recoverable 0 0
Beginning balance 4,401 3,358
Incurred related to:    
Current year 9,013 7,553
Prior years (241) (176)
Total incurred 8,772 7,377
Paid related to:    
Current year 6,397 5,243
Prior years 2,710 1,923
Total paid 9,107 7,166
Plus: Premium deficiency reserve   178
Ending balance 4,066 3,747
Plus: Reinsurance recoverable 0
Ending balance 4,066 3,747
Commercial    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Beginning balance 5,683 4,463
Less: Reinsurance recoverable 60 47
Beginning balance 5,623 4,416
Incurred related to:    
Current year 7,490 7,972
Prior years (292) (365)
Total incurred 7,198 7,607
Paid related to:    
Current year 4,521 4,731
Prior years 3,252 2,648
Total paid 7,773 7,379
Plus: Premium deficiency reserve   0
Ending balance 5,048 4,644
Plus: Reinsurance recoverable 68 46
Ending balance 5,116 4,690
Other    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Beginning balance 85 188
Less: Reinsurance recoverable 0 0
Beginning balance 85 188
Incurred related to:    
Current year 386 514
Prior years (8) (16)
Total incurred 378 498
Paid related to:    
Current year 358 359
Prior years 76 150
Total paid 434 509
Plus: Premium deficiency reserve   0
Ending balance 29 177
Plus: Reinsurance recoverable 0
Ending balance $ 29 $ 177