Pension and other benefits (Tables)

3 Months Ended

Mar. 31, 2025

Retirement Benefits [Abstract]

Net Periodic Benefit Cost for Defined Benefit Pension Plans and Other Benefits

Net periodic benefit (recovery) cost for defined benefit pension plans and other benefits included the following components:        

	For the three months ended March 31
	Pensions				Other benefits				Total
(in millions of Canadian dollars)	2025		2024		2025		2024		2025		2024
Current service cost	$	21	$	21	$	3	$	3	$	24	$	24
Other components of net periodic benefit (recovery) cost:
Interest cost on benefit obligation	117		117		5		6		122		123
Expected return on plan assets	(232)		(223)		—		—		(232)		(223)
Recognized net actuarial loss	2		10		—		—		2		10
Amortization of prior service costs	1		2		—		—		1		2
Total other components of net periodic benefit (recovery) cost	(112)		(94)		5		6		(107)		(88)
Net periodic benefit (recovery) cost	$	(91)	$	(73)	$	8	$	9	$	(83)	$	(64)