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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, 2024
Jun. 30, 2023
Insurance Claims    
Medical claims and benefits payable, beginning balance $ 4,204 $ 3,528
Components of medical care costs related to:    
Current year 17,301 14,180
Prior years (519) (271)
Total medical care costs 16,782 13,909
Payments for medical care costs related to:    
Current year 13,429 11,166
Prior years 3,161 2,650
Total paid 16,590 13,816
Acquired balances, net of post-acquisition adjustments 421 0
Change in non-risk and other payables (240) 56
Medical claims and benefits payable, ending balance 4,577 3,677
Medicaid    
Insurance Claims    
Medical claims and benefits payable, beginning balance 3,444 2,815
Components of medical care costs related to:    
Current year 13,870 11,585
Prior years (458) (241)
Total medical care costs 13,412 11,344
Payments for medical care costs related to:    
Current year 10,931 9,184
Prior years 2,237 2,041
Total paid 13,168 11,225
Acquired balances, net of post-acquisition adjustments 0 0
Change in non-risk and other payables (177) 58
Medical claims and benefits payable, ending balance 3,511 2,992
Medicare    
Insurance Claims    
Medical claims and benefits payable, beginning balance 532 452
Components of medical care costs related to:    
Current year 2,555 1,857
Prior years (52) (6)
Total medical care costs 2,503 1,851
Payments for medical care costs related to:    
Current year 1,877 1,430
Prior years 728 406
Total paid 2,605 1,836
Acquired balances, net of post-acquisition adjustments 421 0
Change in non-risk and other payables (63) (2)
Medical claims and benefits payable, ending balance 788 465
Marketplace    
Insurance Claims    
Medical claims and benefits payable, beginning balance 228 261
Components of medical care costs related to:    
Current year 876 738
Prior years (9) (24)
Total medical care costs 867 714
Payments for medical care costs related to:    
Current year 621 552
Prior years 196 203
Total paid 817 755
Acquired balances, net of post-acquisition adjustments 0 0
Change in non-risk and other payables 0 0
Medical claims and benefits payable, ending balance $ 278 $ 220