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Reinsurance (Tables)
6 Months Ended
Jun. 30, 2020
Credit Loss [Abstract]  
schedule of reinsurance recoverable on ceded insurance
June 30, 2020December 31, 2019
(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
$14,361  $240  $14,181  $240  
Reinsurance recoverable on paid losses and loss expenses
846  63  1,000  76  
Reinsurance recoverable on losses and loss expenses$15,207  $303  $15,181  $316  
Reinsurance recoverable on policy benefits$197  $ $197  $ 
(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:
Six Months Ended
June 30
(in millions of U.S. dollars)2020
Reinsurance recoverable
Valuation allowance for uncollectible reinsurance - beginning of period$316  
Provision for uncollectible reinsurance 
Write-offs charged against the valuation allowance(19) 
Foreign exchange revaluation 
Valuation allowance for uncollectible reinsurance - end of period$303