Reinsurance (Tables)

3 Months Ended

Mar. 31, 2020

Credit Loss [Abstract]

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)	2020
Reinsurance recoverable
Valuation allowance for uncollectible reinsurance - beginning of period	$	316
Provision for uncollectible reinsurance	2
Write-offs charged against the valuation allowance	(13		)
Valuation allowance for uncollectible reinsurance - end of period	$	305