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Medical Claims and Benefits Payable - Components of Change in Medical Claims and Benefits Payable (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Insurance Claims    
Medical claims and benefits payable, beginning balance $ 4,640 $ 4,204
Components of medical care costs related to:    
Current year 19,509 17,301
Prior years (201) (519)
Total medical care costs 19,308 16,782
Payments for medical care costs related to:    
Current year 15,700 13,429
Prior years 3,918 3,161
Total paid 19,618 16,590
Acquired balances, net of post-acquisition adjustments 295 421
Change in non-risk and other payables 260 (240)
Medical claims and benefits payable, ending balance 4,885 4,577
Medicaid    
Insurance Claims    
Medical claims and benefits payable, beginning balance 3,667 3,444
Components of medical care costs related to:    
Current year 14,833 13,870
Prior years (162) (458)
Total medical care costs 14,671 13,412
Payments for medical care costs related to:    
Current year 11,981 10,931
Prior years 2,978 2,237
Total paid 14,959 13,168
Acquired balances, net of post-acquisition adjustments 0 0
Change in non-risk and other payables 260 (177)
Medical claims and benefits payable, ending balance 3,639 3,511
Medicare    
Insurance Claims    
Medical claims and benefits payable, beginning balance 722 532
Components of medical care costs related to:    
Current year 2,813 2,555
Prior years (70) (52)
Total medical care costs 2,743 2,503
Payments for medical care costs related to:    
Current year 2,203 1,877
Prior years 641 728
Total paid 2,844 2,605
Acquired balances, net of post-acquisition adjustments 128 421
Change in non-risk and other payables 0 (63)
Medical claims and benefits payable, ending balance 749 788
Marketplace    
Insurance Claims    
Medical claims and benefits payable, beginning balance 251 228
Components of medical care costs related to:    
Current year 1,815 876
Prior years 31 (9)
Total medical care costs 1,846 867
Payments for medical care costs related to:    
Current year 1,465 621
Prior years 284 196
Total paid 1,749 817
Acquired balances, net of post-acquisition adjustments 125 0
Change in non-risk and other payables 0 0
Medical claims and benefits payable, ending balance 473 278
Other    
Insurance Claims    
Medical claims and benefits payable, beginning balance 0 0
Components of medical care costs related to:    
Current year 48 0
Prior years 0 0
Total medical care costs 48 0
Payments for medical care costs related to:    
Current year 51 0
Prior years 15 0
Total paid 66 0
Acquired balances, net of post-acquisition adjustments 42 0
Change in non-risk and other payables 0 0
Medical claims and benefits payable, ending balance $ 24 $ 0