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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, 2024
Mar. 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 period $ 22,752 $ 20,032
Unpaid losses and loss adjustment expenses recoverable 6,690 6,280
Net reserve for losses and loss adjustment expenses at beginning of period 16,062 13,752
Net incurred losses and loss adjustment expenses relating to losses occurring in:    
Current year 1,852 1,607
Prior years (124) (136)
Total net incurred losses and loss adjustment expenses 1,728 1,471
Net foreign exchange (gains) losses and other (84) 55
Net paid losses and loss adjustment expenses relating to losses occurring in:    
Current year (92) (140)
Prior years (978) (727)
Total net paid losses and loss adjustment expenses (1,070) (867)
Net reserve for losses and loss adjustment expenses at end of period 16,636 14,411
Unpaid losses and loss adjustment expenses recoverable 7,069 6,347
Reserve for losses and loss adjustment expenses at end of period $ 23,705 $ 20,758