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Medical Claims and Benefits Payable - Components of Change in Medical Claims and Benefits Payable (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Insurance Claims    
Medical claims and benefits payable, beginning balance $ 4,640 $ 4,204
Components of medical care costs related to:    
Current year 9,665 8,748
Prior years (186) (334)
Total medical care costs 9,479 8,414
Payments for medical care costs related to:    
Current year 5,789 5,409
Prior years 3,684 2,879
Total paid 9,473 8,288
Acquired balances, net of post-acquisition adjustments 245 391
Change in non-risk and other payables (87) (150)
Medical claims and benefits payable, ending balance 4,804 4,571
Medicaid    
Insurance Claims    
Medical claims and benefits payable, beginning balance 3,667 3,444
Components of medical care costs related to:    
Current year 7,495 7,006
Prior years (156) (289)
Total medical care costs 7,339 6,717
Payments for medical care costs related to:    
Current year 4,593 4,490
Prior years 2,760 2,066
Total paid 7,353 6,556
Acquired balances, net of post-acquisition adjustments 0 0
Change in non-risk and other payables (87) (119)
Medical claims and benefits payable, ending balance 3,566 3,486
Medicare    
Insurance Claims    
Medical claims and benefits payable, beginning balance 722 532
Components of medical care costs related to:    
Current year 1,352 1,318
Prior years (56) (39)
Total medical care costs 1,296 1,279
Payments for medical care costs related to:    
Current year 721 702
Prior years 623 630
Total paid 1,344 1,332
Acquired balances, net of post-acquisition adjustments 122 391
Change in non-risk and other payables 0 (31)
Medical claims and benefits payable, ending balance 796 839
Marketplace    
Insurance Claims    
Medical claims and benefits payable, beginning balance 251 228
Components of medical care costs related to:    
Current year 795 424
Prior years 26 (6)
Total medical care costs 821 418
Payments for medical care costs related to:    
Current year 458 217
Prior years 287 183
Total paid 745 400
Acquired balances, net of post-acquisition adjustments 88 0
Change in non-risk and other payables 0 0
Medical claims and benefits payable, ending balance 415 246
Other    
Insurance Claims    
Medical claims and benefits payable, beginning balance 0 0
Components of medical care costs related to:    
Current year 23 0
Prior years 0 0
Total medical care costs 23 0
Payments for medical care costs related to:    
Current year 17 0
Prior years 14 0
Total paid 31 0
Acquired balances, net of post-acquisition adjustments 35 0
Change in non-risk and other payables 0 0
Medical claims and benefits payable, ending balance $ 27 $ 0