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Unpaid losses and loss adjustment expenses - Reconciliation of changes in claim liabilities (Detail) - Property and Casualty Insurance and Reinsurance, Excluding 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 $ 111,082 $ 107,472
Reinsurance recoverable on unpaid losses at the beginning of the year (4,893) (5,025)
Net liabilities at the beginning of the year 106,189 102,447
Incurred losses and loss adjustment expenses, current accident year 28,359 29,827
Incurred losses and loss adjustment expenses, prior accident years (1,167) (1,948)
Total incurred losses and loss adjustment expenses 27,192 27,879
Paid losses and loss adjustment expenses, current accident year (9,491) (9,968)
Paid losses and loss adjustment expenses, prior accident years (15,626) (16,664)
Total paid losses and loss adjustment expenses (25,117) (26,632)
Foreign currency effect (110) 267
Net liabilities at end of period 108,154 103,961
Reinsurance recoverable on unpaid losses at end of period 4,650 5,069
Gross liabilities at end of period $ 112,804 $ 109,030