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Pension and other benefits (Tables)
 9 Months Ended
Sep. 30, 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 September 30
PensionsOther benefitsTotal
(in millions of Canadian dollars)202520242025202420252024
Current service cost $22 $21 $3 $3 $25 $24 
Other components of net periodic benefit (recovery) cost:
Interest cost on benefit obligation117 116 5 6 122 122 
Expected return on plan assets(232)(223)— — (232)(223)
Recognized net actuarial loss1 10 — — 1 10 
Amortization of prior service costs2 2 — — 2 2 
Total other components of net periodic benefit (recovery) cost(112)(95)5 6 (107)(89)
Net periodic benefit (recovery) cost$(90)$(74)$8 $9 $(82)$(65)
For the nine months ended September 30
PensionsOther benefitsTotal
(in millions of Canadian dollars)202520242025202420252024
Current service cost $64 $63 $10 $9 $74 $72 
Other components of net periodic benefit (recovery) cost:
Interest cost on benefit obligation350 350 16 18 366 368 
Expected return on plan assets(695)(668)— — (695)(668)
Recognized net actuarial loss (gain)5 30 (1)— 4 30 
Amortization of prior service costs4 5 — — 4 5 
Total other components of net periodic benefit (recovery) cost(336)(283)15 18 (321)(265)
Net periodic benefit (recovery) cost$(272)$(220)$25 $27 $(247)$(193)