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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
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]    
Reserve for losses and loss adjustment expenses at beginning of period $ 29,369 $ 22,752
Unpaid losses and loss adjustment expenses recoverable 7,821 6,690
Net reserve for losses and loss adjustment expenses at beginning of period 21,548 16,062
Net incurred losses and loss adjustment expenses relating to losses occurring in:    
Current year 2,784 1,852
Prior years (197) (124)
Total net incurred losses and loss adjustment expenses 2,587 1,728
Net foreign exchange (gains) losses and other 193 (84)
Net paid losses and loss adjustment expenses relating to losses occurring in:    
Current year (441) (92)
Prior years (1,320) (978)
Total net paid losses and loss adjustment expenses (1,761) (1,070)
Net reserve for losses and loss adjustment expenses at end of period 22,567 16,636
Unpaid losses and loss adjustment expenses recoverable 8,379 7,069
Reserve for losses and loss adjustment expenses at end of period $ 30,946 $ 23,705