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Reinsurance (Tables)
 6 Months Ended
Jun. 30, 2024
Reinsurance Disclosures [Abstract]  
schedule of reinsurance recoverable on ceded insurance
June 30, 2024December 31, 2023
(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$17,409 $299 $17,884 $285 
Reinsurance recoverable on paid losses and loss expenses1,946 82 2,068 82 
Reinsurance recoverable on losses and loss expenses$19,355 $381 $19,952 $367 
Reinsurance recoverable on policy benefits$291 $— $280 $— 
(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:
Six Months Ended
June 30
(in millions of U.S. dollars)20242023
Valuation allowance for uncollectible reinsurance - beginning of period$367 $351 
Provision for uncollectible reinsurance18 15 
Write-offs charged against the valuation allowance(3)(6)
Foreign exchange revaluation(1)1 
Valuation allowance for uncollectible reinsurance - end of period$381 $361