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Unpaid losses and loss expenses (RF) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Unpaid Losses and Loss Expenses [Roll Forward]    
Gross unpaid losses and loss expenses – beginning of period $ 80,122 $ 75,747
Reinsurance recoverable on unpaid losses – beginning of period (1) [1] (17,884) (17,086)
Net unpaid losses and loss expenses – beginning of period 62,238 58,661
Current Year Claims and Claims Adjustment Expense 12,604 11,227
Prior Year Claims and Claims Adjustment Expense [2] (446) (396)
Total, Incurred 12,158 10,831
Net loss and loss expenses paid, Current Year 2,492 2,264
Net loss and loss expenses paid, Prior Years 6,918 7,527
Total, Paid 9,410 9,791
Foreign currency revaluation and other (204) 171
Net unpaid losses and loss expenses – end of period 64,782 59,872
Reinsurance recoverable on unpaid losses (1) [1] 17,409 16,608
Gross unpaid losses and loss expenses – end of period 82,191 76,480
prior period development, net adjustments $ 47 $ 0
[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 $47 million and nil for the six months ended June 30, 2024 and 2023, respectively.