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Health Care Costs Payable - Components of Change in Health Care Costs Payable (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Health care costs payable, beginning of the period $ 15,064 $ 12,049
Less: Reinsurance recoverables 81 5
Less: Impact of discount rate on long-duration insurance reserves (1) (23)
Health care costs payable, beginning of the period, net 14,984 12,067
Add: Components of incurred health care costs    
Current year 93,496 85,541
Prior years (1,926) (845)
Total incurred health care costs 91,570 84,696
Less: Claims paid    
Current year 79,687 71,356
Prior years 11,567 10,886
Total claims paid 91,254 82,242
Health care costs payable, end of the period, net 15,300 14,521
Add: Premium deficiency reserves 728 670
Add: Reinsurance recoverables 94 65
Add: Impact of discount rate on long-duration insurance reserves (24) (19)
Health care costs payable, end of the period 16,098 15,237
Health Care Benefits    
Less: Claims paid    
Benefit costs recorded in other insurance liabilities 41 70
Corporate/ Other    
Less: Claims paid    
Benefit costs recorded in other insurance liabilities $ 133 $ 142