v3.25.2
Employee retirement benefits (Tables)
6 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Schedule of net benefit costs
The components of net benefit cost were as follows:
 
       Second Quarter
       Six Months
       to June 30
millions of Canadian dollars2025 2024 2025 2024 
Pension benefits:
Service cost46 46 93 92 
Interest cost91 92 184 183 
Expected return on plan assets(98)(114)(197)(227)
Amortization of prior service cost8 14 14 
Amortization of actuarial loss (gain)3 12 6 24 
Net benefit cost50 43 100 86 
Other postretirement benefits:   
Service cost1 2 
Interest cost6 11 12 
Amortization of prior service cost (credit)(1)— (2)— 
Amortization of actuarial loss (gain)(3)(2)(5)(4)
Net benefit cost3 6 15