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Retroactive reinsurance contracts - Reconciliation of changes in claim liabilities and incurred losses and loss adjustment expenses (Detail) - Retroactive Reinsurance [Member] - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Liability for Claims and Claims Adjustment Expense [Line Items]    
Gross liabilities at the beginning of the year $ 34,647 $ 35,415
Total incurred losses and loss adjustment expenses 363 431
Paid losses and loss adjustment expenses (1,066) (1,033)
Foreign currency effect (19) 24
Gross liabilities at end of period 33,494 34,421
Unpaid Losses and Loss Adjustment Expenses [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Incurred losses and loss adjustment expenses, current contract year 51  
Incurred losses and loss adjustment expenses, prior contract year (119) 15
Total incurred losses and loss adjustment expenses (68) 15
Deferred Charges Reinsurance Assumed [Member]    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Total incurred losses and loss adjustment expenses $ 431 $ 416