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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, 2023
Jun. 30, 2022
Insurance Claims    
Medical claims and benefits payable, beginning balance $ 3,528 $ 3,363
Components of medical care costs related to:    
Current year 14,180 13,746
Prior years (271) (311)
Total medical care costs 13,909 13,435
Payments for medical care costs related to:    
Current year 11,166 10,622
Prior years 2,650 2,411
Total paid 13,816 13,033
Acquired balances, net of post-acquisition adjustments   7
Change in non-risk and other provider payables 56 3
Medical claims and benefits payable, ending balance 3,677 3,775
Medicaid    
Insurance Claims    
Medical claims and benefits payable, beginning balance 2,815 2,580
Components of medical care costs related to:    
Current year 11,585 11,059
Prior years (241) (243)
Total medical care costs 11,344 10,816
Payments for medical care costs related to:    
Current year 9,184 8,532
Prior years 2,041 1,801
Total paid 11,225 10,333
Acquired balances, net of post-acquisition adjustments   7
Change in non-risk and other provider payables 58 3
Medical claims and benefits payable, ending balance 2,992 3,073
Medicare    
Insurance Claims    
Medical claims and benefits payable, beginning balance 452 404
Components of medical care costs related to:    
Current year 1,857 1,681
Prior years (6) (33)
Total medical care costs 1,851 1,648
Payments for medical care costs related to:    
Current year 1,430 1,270
Prior years 406 330
Total paid 1,836 1,600
Acquired balances, net of post-acquisition adjustments   0
Change in non-risk and other provider payables (2) 0
Medical claims and benefits payable, ending balance 465 452
Marketplace    
Insurance Claims    
Medical claims and benefits payable, beginning balance 261 379
Components of medical care costs related to:    
Current year 738 1,006
Prior years (24) (35)
Total medical care costs 714 971
Payments for medical care costs related to:    
Current year 552 820
Prior years 203 280
Total paid 755 1,100
Acquired balances, net of post-acquisition adjustments   0
Change in non-risk and other provider payables 0 0
Medical claims and benefits payable, ending balance $ 220 $ 250