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Reinsurance (Tables)
 3 Months Ended
Mar. 31, 2021
Reinsurance Disclosures [Abstract]  
schedule of reinsurance recoverable on ceded insurance
March 31, 2021December 31, 2020
(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$14,860 $258 $14,647 $257 
Reinsurance recoverable on paid losses and loss expenses1,054 59 945 57 
Reinsurance recoverable on losses and loss expenses$15,914 $317 $15,592 $314 
Reinsurance recoverable on policy benefits$202 $4 $206 $5 
(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 loss and loss expenses:
Three Months Ended
March 31
(in millions of U.S. dollars)20212020
Valuation allowance for uncollectible reinsurance - beginning of period$314 $316 
Provision for uncollectible reinsurance3 2 
Write-offs charged against the valuation allowance— (13)
Valuation allowance for uncollectible reinsurance - end of period$317 $305