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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
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Liability for Claims and Claims Adjustment Expense [Line Items]    
Gross liabilities at the beginning of the year $ 115,151 $ 111,082
Reinsurance recoverable on unpaid losses at the beginning of the year (4,593) (4,893)
Net liabilities at the beginning of the year 110,558 106,189
Losses and loss adjustment expenses incurred, current accident year 43,124 43,166
Losses and loss adjustment expenses incurred, prior accident years (1,182) (992)
Total losses and loss adjustment expenses incurred 41,942 42,174
Losses and loss adjustment expenses paid, current accident year (16,086) (16,011)
Losses and loss adjustment expenses paid, prior accident years (22,165) (21,370)
Total losses and loss adjustment expenses paid (38,251) (37,381)
Foreign currency effect 949 206
Net liabilities at end of period 115,198 111,188
Reinsurance recoverable on unpaid losses at end of period 4,639 4,648
Gross liabilities at end of period $ 119,837 $ 115,836