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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, 2023
Mar. 31, 2022
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]    
Reserve for losses and loss adjustment expenses at beginning of period $ 20,032 $ 17,757
Unpaid losses and loss adjustment expenses recoverable 6,280 5,599
Net reserve for losses and loss adjustment expenses at beginning of period 13,752 12,158
Net incurred losses and loss adjustment expenses relating to losses occurring in:    
Current year 1,607 1,142
Prior years (136) (141)
Total net incurred losses and loss adjustment expenses 1,471 1,001
Net foreign exchange (gains) losses and other 55 (33)
Net paid losses and loss adjustment expenses relating to losses occurring in:    
Current year (140) (71)
Prior years (727) (656)
Total net paid losses and loss adjustment expenses (867) (727)
Net reserve for losses and loss adjustment expenses at end of period 14,411 12,399
Unpaid losses and loss adjustment expenses recoverable 6,347 5,710
Reserve for losses and loss adjustment expenses at end of period $ 20,758 $ 18,109