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Insurance - Analysis of changes in the liability for losses and loss adjustment expenses, net of reinsurance (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Analysis of changes in the liability for losses and loss adjustment expenses, net of reinsurance    
Balance at beginning of year $ 15,094 $ 14,179
Less reinsurance recoverables, net of allowance 5,306 4,957
Net liability at beginning of year 9,788 9,222
Provision for losses and LAE occurring in the current period 976 985
Net decrease in the provision for claims of prior years (70) (20)
Total losses and LAE incurred 906 965
Payments for losses and LAE of:    
Current year (92) (104)
Prior years (796) (863)
Total payments (888) (967)
Foreign currency translation and other (2) (2)
Net liability at end of period 9,804 9,218
Add back reinsurance recoverables, net of allowance 5,110 4,752
Gross unpaid losses and LAE included in the balance sheet at end of period $ 14,914 $ 13,970