v3.26.1
Insurance Liabilities - Components of Change in Health Care Costs Payable (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Health care costs payable, beginning of the period $ 15,399 $ 15,064
Less: Reinsurance recoverables 90 81
Less: Impact of discount rate on long-duration insurance reserves (20) (1)
Health care costs payable, beginning of the period, net 15,329 14,984
Add: Components of incurred health care costs    
Current year 30,374 30,293
Prior years (1,093) (1,651)
Total incurred health care costs 29,281 28,642
Less: Claims paid    
Current year 18,255 19,312
Prior years 10,951 9,749
Total claims paid 29,206 29,061
Health care costs payable, end of the period, net 15,404 14,565
Add: Premium deficiency reserve 0 431
Add: Reinsurance recoverables 132 114
Add: Impact of discount rate on long-duration insurance reserves (18) 2
Health care costs payable, end of the period 15,518 15,112
Health Care Benefits    
Less: Claims paid    
Benefit costs recorded in other insurance liabilities 31 16
Corporate/ Other    
Less: Claims paid    
Benefit costs recorded in other insurance liabilities $ 46 $ 46