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Employee retirement benefits
 3 Months Ended
Mar. 31, 2024
Retirement Benefits [Abstract]  
Employee retirement benefits Employee retirement benefits
The components of net benefit cost were as follows:
 
       Three Months
       to March 31
millions of Canadian dollars2024 2023 
Pension benefits:
Service cost46 41 
Interest cost91 93 
Expected return on plan assets(113)(93)
Amortization of prior service cost7 4 
Amortization of actuarial loss (gain)12 11 
Net benefit cost43 56 
Other postretirement benefits:
Service cost4 3 
Interest cost6 7 
Amortization of actuarial loss (gain)(2)(2)
Net benefit cost8 8