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Health Care Costs Payable - Components of Change in Health Care Costs Payable (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 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 61,345 56,177
Prior years (1,900) (662)
Total incurred health care costs 59,445 55,515
Less: Claims paid    
Current year 48,791 43,218
Prior years 11,342 10,514
Total claims paid 60,133 53,732
Health care costs payable, end of the period, net 14,296 13,850
Add: Premium deficiency reserves 902 0
Add: Reinsurance recoverables 103 59
Add: Impact of discount rate on long-duration insurance reserves (30) (24)
Health care costs payable, end of the period 15,271 13,885
Health Care Benefits    
Less: Claims paid    
Benefit costs recorded in other insurance liabilities 19 48
Corporate/ Other    
Less: Claims paid    
Benefit costs recorded in other insurance liabilities $ 86 $ 93