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Reinsurance
 9 Months Ended
Sep. 30, 2023
Reinsurance Disclosures [Abstract]  
Reinsurance [Text Block] Reinsurance
Reinsurance recoverable on ceded reinsurance
September 30, 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$17,808 $318 $17,086 $289 
Reinsurance recoverable on paid losses and loss expenses1,942 52 1,773 62 
Reinsurance recoverable on losses and loss expenses$19,750 $370 $18,859 $351 
Reinsurance recoverable on policy benefits$315 $1 $302 $4 
(1)Net of valuation allowance for uncollectible reinsurance.

The increase in reinsurance recoverable on losses and loss expenses was primarily due to the consolidation of Huatai and unfavorable prior period development on ceded reserves.
The following table presents a roll-forward of valuation allowance for uncollectible reinsurance related to Reinsurance recoverable on loss and loss expenses:
Nine Months Ended
September 30
(in millions of U.S. dollars)20232022
Valuation allowance for uncollectible reinsurance - beginning of period$351 $329 
Provision for uncollectible reinsurance27 30 
Write-offs charged against the valuation allowance(8)(4)
Foreign exchange revaluation— (3)
Valuation allowance for uncollectible reinsurance - end of period$370 $352