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Insurance - Analysis of changes in the liability for losses and loss adjustment expenses, net of reinsurance (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Analysis of changes in the liability for losses and loss adjustment expenses, net of reinsurance      
Balance at beginning of period $ 14,179 $ 13,087 $ 11,974
Less reinsurance recoverables, net of allowance 4,957 4,288 3,767
Net liability at beginning of period 9,222 8,799 8,207
Provision for losses and LAE occurring in the current year 4,469 4,524 4,256
Net decrease in the provision for claims of prior years (81) (64) (223)
Total losses and LAE incurred 4,388 4,460 4,033
Payments for losses and LAE of:      
Current year (1,330) (1,497) (1,261)
Prior years (2,488) (2,537) (2,181)
Total payments (3,818) (4,034) (3,442)
Foreign currency translation and other (4) (3) 1
Net liability at end of period 9,788 9,222 8,799
Add back reinsurance recoverables, net of allowance 5,306 4,957 4,288
Gross unpaid losses and LAE included in the balance sheet $ 15,094 $ 14,179 $ 13,087