Reinsurance (Tables)

9 Months Ended

Sep. 30, 2020

Credit Loss [Abstract]

schedule of reinsurance recoverable on ceded insurance

	September 30, 2020				December 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	$	14,767	$	255	$	14,181	$	240
Reinsurance recoverable on paid losses and loss expenses	903		65		1,000		76
Reinsurance recoverable on losses and loss expenses	$	15,670	$	320	$	15,181	$	316
Reinsurance recoverable on policy benefits	$	203	$	4	$	197	$	4

(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:

	Nine Months Ended
	September 30
(in millions of U.S. dollars)	2020
Reinsurance recoverable
Valuation allowance for uncollectible reinsurance - beginning of period	$	316
Provision for uncollectible reinsurance	21
Write-offs charged against the valuation allowance	(19)
Foreign exchange revaluation	2
Valuation allowance for uncollectible reinsurance - end of period	$	320