v3.26.1
Employee retirement benefits (Tables)
 3 Months Ended
Mar. 31, 2026
Retirement Benefits [Abstract]  
Schedule of net benefit costs
The components of net benefit cost were as follows:
 
       Three Months
       to March 31
millions of Canadian dollars2026 2025 
Pension benefits:
Service cost43 47 
Interest cost95 93 
Expected return on plan assets(101)(99)
Amortization of prior service cost7 6 
Amortization of actuarial loss (gain)— 3 
Net benefit cost44 50 
Other postretirement benefits:
Service cost1 1 
Interest cost6 5 
Amortization of prior service cost (credit)(1)(1)
Amortization of actuarial loss (gain)(3)(2)
Net benefit cost3 3