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Reserve for Losses and Loss Adjustment Expenses - Reconciliation of beginning and ending balances of losses and loss adjustment reserves (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]      
Reserve for losses and loss adjustment expenses at beginning of year $ 29,369 $ 22,752 $ 20,032
Unpaid losses and loss adjustment expenses recoverable 7,821 6,690 6,280
Net reserve for losses and loss adjustment expenses at beginning of year 21,548 16,062 13,752
Net incurred losses and loss adjustment expenses relating to losses occurring in:      
Current year 9,970 8,849 6,784
Prior years (600) (507) (538)
Total net incurred losses and loss adjustment expenses 9,370 8,342 6,246
Net losses and loss adjustment expense reserves of acquired business [1] 50 2,477 0
Foreign exchange (gains) losses and other 550 (260) 157
Net paid losses and loss adjustment expenses relating to losses occurring in:      
Current year (1,862) (1,176) (1,081)
Prior years (5,163) (3,897) (3,012)
Total net paid losses and loss adjustment expenses (7,025) (5,073) (4,093)
Net reserve for losses and loss adjustment expenses at end of year 24,493 21,548 16,062
Unpaid losses and loss adjustment expenses recoverable 9,054 7,821 6,690
Reserve for losses and loss adjustment expenses at end of year $ 33,547 $ 29,369 $ 22,752
[1] Activity in the 2025 and 2024 periods primarily related to the MCE Acquisition (see note 2).