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Medical Claims and Benefits Payable - Components of Change in Medical Claims and Benefits Payable (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Insurance Claims    
Medical claims and benefits payable, beginning balance $ 4,204 $ 3,528
Components of medical care costs related to:    
Current year 26,050 21,573
Prior years (625) (358)
Total medical care costs 25,425 21,215
Payments for medical care costs related to:    
Current year 22,172 18,228
Prior years 3,215 2,707
Total paid 25,387 20,935
Acquired balances, net of post-acquisition adjustments 463 96
Change in non-risk and other payables 27 331
Medical claims and benefits payable, ending balance 4,732 4,235
Medicaid    
Insurance Claims    
Medical claims and benefits payable, beginning balance 3,444 2,815
Components of medical care costs related to:    
Current year 20,903 17,630
Prior years (553) (327)
Total medical care costs 20,350 17,303
Payments for medical care costs related to:    
Current year 17,813 14,961
Prior years 2,256 2,074
Total paid 20,069 17,035
Acquired balances, net of post-acquisition adjustments 0 83
Change in non-risk and other payables 27 335
Medical claims and benefits payable, ending balance 3,752 3,501
Medicare    
Insurance Claims    
Medical claims and benefits payable, beginning balance 532 452
Components of medical care costs related to:    
Current year 3,798 2,811
Prior years (70) (6)
Total medical care costs 3,728 2,805
Payments for medical care costs related to:    
Current year 3,237 2,340
Prior years 742 424
Total paid 3,979 2,764
Acquired balances, net of post-acquisition adjustments 463 13
Change in non-risk and other payables 0 (4)
Medical claims and benefits payable, ending balance 744 502
Marketplace    
Insurance Claims    
Medical claims and benefits payable, beginning balance 228 261
Components of medical care costs related to:    
Current year 1,349 1,132
Prior years (2) (25)
Total medical care costs 1,347 1,107
Payments for medical care costs related to:    
Current year 1,122 927
Prior years 217 209
Total paid 1,339 1,136
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 $ 236 $ 232