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Unpaid losses and loss expenses (RF) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Liability for Claims and Claims Adjustment Expense [Line Items]    
Gross unpaid losses and loss expenses – beginning of period $ 84,004 $ 80,122
Reinsurance recoverable on unpaid losses and loss expenses - beginning of period [1] 17,734 17,884
Net unpaid losses and loss expenses – beginning of period 66,270 62,238
Current Year Claims and Claims Adjustment Expense 21,342 20,302
Prior Year Claims and Claims Adjustment Expense [2] (923) (761)
Total, Incurred 20,419 19,541
Net loss and loss expenses paid, Current Year 5,551 5,005
Net loss and loss expenses paid, Prior Years 12,135 10,074
Total, Paid 17,686 15,079
Foreign currency revaluation and other 1,015 (5)
Net unpaid losses and loss expenses – end of period 70,018 66,695
Reinsurance recoverable on unpaid losses and loss expenses - end of period [1] (18,421) (17,631)
Gross unpaid losses and loss expenses – end of period 88,439 84,326
prior period development, net adjustments $ 58 $ 118
[1] Net of valuation allowance for uncollectible reinsurance.
[2] Relates to prior period loss reserve development only and excludes prior period development related to reinstatement premiums, expense adjustments, earned premiums, and A&H long-duration lines totaling $58 million and $118 million for the nine months ended September 30, 2025 and 2024, respectively.