Reinsurance (Tables)

3 Months Ended

Mar. 31, 2023

Reinsurance Disclosures [Abstract]

schedule of reinsurance recoverable on ceded insurance

	March 31, 2023				December 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	$	16,520	$	294	$	17,086	$	289
Reinsurance recoverable on paid losses and loss expenses	1,621		57		1,773		62
Reinsurance recoverable on losses and loss expenses	$	18,141	$	351	$	18,859	$	351
Reinsurance recoverable on policy benefits	$	279	$	1	$	302	$	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:

	Three Months Ended
	March 31
(in millions of U.S. dollars)	2023		2022
Valuation allowance for uncollectible reinsurance - beginning of period	$	351	$	329
Provision for uncollectible reinsurance	5		3
Write-offs charged against the valuation allowance	(5)		(4)
Foreign exchange revaluation	—		1
Valuation allowance for uncollectible reinsurance - end of period	$	351	$	329