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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 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 $ 20,758 $ 18,109 $ 20,032 $ 17,757
Unpaid losses and loss adjustment expenses recoverable 6,347 5,710 6,280 5,599
Net reserve for losses and loss adjustment expenses at beginning of period 14,411 12,399 13,752 12,158
Net incurred losses and loss adjustment expenses relating to losses occurring in:        
Current year 1,612 1,274 3,219 2,416
Prior years (121) (171) (257) (312)
Total net incurred losses and loss adjustment expenses 1,491 1,103 2,962 2,104
Net foreign exchange (gains) losses and other 44 (249) 99 (282)
Net paid losses and loss adjustment expenses relating to losses occurring in:        
Current year (215) (166) (355) (237)
Prior years (857) (579) (1,584) (1,235)
Total net paid losses and loss adjustment expenses (1,072) (745) (1,939) (1,472)
Net reserve for losses and loss adjustment expenses at end of period 14,874 12,508 14,874 12,508
Unpaid losses and loss adjustment expenses recoverable 6,394 5,686 6,394 5,686
Reserve for losses and loss adjustment expenses at end of period $ 21,268 $ 18,194 $ 21,268 $ 18,194