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Reinsurance
 3 Months Ended
Mar. 31, 2023
Reinsurance Disclosures [Abstract]  
Reinsurance [Text Block] Reinsurance
Reinsurance recoverable on ceded reinsurance
March 31, 2023December 31, 2022
(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$16,520 $294 $17,086 $289 
Reinsurance recoverable on paid losses and loss expenses1,621 57 1,773 62 
Reinsurance recoverable on losses and loss expenses$18,141 $351 $18,859 $351 
Reinsurance recoverable on policy benefits$279 $1 $302 $4 
(1)Net of valuation allowance for uncollectible reinsurance.

The decrease in reinsurance recoverable on losses and loss expenses was primarily due to a seasonal decrease in crop recoverables, and collections.
The following table presents a roll-forward of valuation allowance for uncollectible reinsurance related to Reinsurance recoverable on loss and loss expenses:
Three Months Ended
March 31
(in millions of U.S. dollars)20232022
Valuation allowance for uncollectible reinsurance - beginning of period$351 $329 
Provision for uncollectible reinsurance5 3 
Write-offs charged against the valuation allowance(5)(4)
Foreign exchange revaluation— 1 
Valuation allowance for uncollectible reinsurance - end of period$351 $329