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Reinsurance (Tables)
 3 Months Ended
Mar. 31, 2025
Reinsurance Disclosures [Abstract]  
schedule of reinsurance recoverable on ceded insurance
March 31, 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$18,081 $254 $17,734 $242 
Reinsurance recoverable on paid losses and loss expenses1,934 66 2,043 68 
Reinsurance recoverable on losses and loss expenses$20,015 $320 $19,777 $310 
Reinsurance recoverable on policy benefits$267 $— $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:
Three Months Ended
March 31
(in millions of U.S. dollars)20252024
Valuation allowance for uncollectible reinsurance - beginning of period$310 $367 
Provision for uncollectible reinsurance11 8 
Write-offs charged against the valuation allowance(2)— 
Foreign exchange revaluation1 — 
Valuation allowance for uncollectible reinsurance - end of period$320 $375