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Reinsurance (Tables)
 9 Months Ended
Sep. 30, 2025
Reinsurance Disclosures [Abstract]  
schedule of reinsurance recoverable on ceded insurance
September 30, 2025December 31, 2024
(in millions of U.S. dollars)
Net Reinsurance Recoverable (1)
Valuation allowance
Net Reinsurance Recoverable (1)
Valuation allowance
Reinsurance recoverable on unpaid losses and loss expenses$18,421 $265 $17,734 $242 
Reinsurance recoverable on paid losses and loss expenses1,806 61 2,043 68 
Reinsurance recoverable on losses and loss expenses$20,227 $326 $19,777 $310 
Reinsurance recoverable on policy benefits$302 $— $289 $— 
(1)Net of valuation allowance for uncollectible reinsurance.
Reinsurance Recoverable, Allowance for Credit Loss [Table Text Block]
The following table presents a roll-forward of valuation allowance for uncollectible reinsurance related to Reinsurance recoverable on losses and loss expenses:
Nine Months Ended
September 30
(in millions of U.S. dollars)20252024
Valuation allowance for uncollectible reinsurance - beginning of period$310 $367 
Provision for uncollectible reinsurance20 24 
Write-offs charged against the valuation allowance(7)(4)
Foreign exchange revaluation3 1 
Valuation allowance for uncollectible reinsurance - end of period$326 $388