Postretirement benefits (Tables)

3 Months Ended

Mar. 31, 2025

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

The components of net pension and other postretirement benefit costs (benefits) reflected in Net income in the Consolidated statements of operations were as follows:

	Pension Benefit Plans								Other Postretirement Benefit Plans
	2025				2024				2025		2024
Three Months Ended March 31	U.S. Plans		Non-U.S. Plans		U.S. Plans		Non-U.S. Plans
(in millions of U.S. dollars)
Service cost	$	—	$	2	$	—	$	2	$	—	$	—
Non-service cost (benefit):
Interest cost	34		9		33		9		—		1
Expected return on plan assets	(63)		(13)		(61)		(13)		—		(1)
Amortization of net actuarial (gain) loss	(2)		—		—		1		(1)		(1)
Amortization of prior service cost	—		—		—		—		—		—
Settlements	—		—		—		—		—		—
Total non-service cost (benefit)	(31)		(4)		(28)		(3)		(1)		(1)
Net periodic benefit cost (benefit)	$	(31)	$	(2)	$	(28)	$	(1)	$	(1)	$	(1)

The line items in which the service cost and non-service cost (benefit) components of net periodic cost (benefit) are included in the Consolidated statements of operations were as follows:

	Pension Benefit Plans				Other Postretirement Benefit Plans
Three Months Ended March 31	2025		2024		2025		2024
(in millions of U.S. dollars)
Service cost:
Losses and loss expenses	$	—	$	—	$	—	$	—
Administrative expenses	2		2		—		—
Total service cost	2		2		—		—
Non-service cost (benefit):
Losses and loss expenses	(3)		(3)		—		—
Administrative expenses	(32)		(28)		(1)		(1)
Total non-service cost (benefit)	(35)		(31)		(1)		(1)
Net periodic benefit cost (benefit)	$	(33)	$	(29)	$	(1)	$	(1)