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Pension and other benefits
 3 Months Ended
Mar. 31, 2025
Retirement Benefits [Abstract]  
Pension and other benefits Pension and other benefits
During the three months ended March 31, 2025, the Company made contributions to its defined benefit pension plans of $4 million (three months ended March 31, 2024 - $3 million).

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

For the three months ended March 31
PensionsOther benefitsTotal
(in millions of Canadian dollars)202520242025202420252024
Current service cost $21 $21 $3 $3 $24 $24 
Other components of net periodic benefit (recovery) cost:
Interest cost on benefit obligation117 117 5 6 122 123 
Expected return on plan assets(232)(223)— — (232)(223)
Recognized net actuarial loss2 10 — — 2 10 
Amortization of prior service costs1 2 — — 1 2 
Total other components of net periodic benefit (recovery) cost(112)(94)5 6 (107)(88)
Net periodic benefit (recovery) cost$(91)$(73)$8 $9 $(83)$(64)