v3.26.3
Employee retirement benefits
 9 Months Ended
Sep. 30, 2026
Retirement Benefits [Abstract]  
Employee retirement benefits Employee retirement benefits
The components of net benefit cost were as follows:
       Third Quarter
       Nine Months
       to September 30
millions of Canadian dollars2026 2025 2026 2025 
Pension benefits:
Service cost43 46 130 139 
Interest cost94 93 284 277 
Expected return on plan assets(101)(99)(302)(296)
Amortization of prior service cost9 7 22 21 
Amortization of actuarial loss (gain)(1)2 (1)8 
Net pension enhancement— 19 — 19 
Net benefit cost44 68 133 168 
Other postretirement benefits:
Service cost— 2 2 4 
Interest cost7 4 18 15 
Amortization of prior service cost (credit)(2)(1)(4)(3)
Amortization of actuarial loss (gain)(2)(1)(7)(6)
Net other postretirement benefits enhancement and curtailment cost(6)1 (7)1 
Net benefit cost(3)5 2 11