v3.25.4
Operating costs (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Labour costs    
Wages, salaries and related taxes and benefits $ (3,992) $ (4,134)
Post-employment benefit plans service cost (net of capitalized amounts) (198) (208)
Other labour costs (883) (987)
Less:    
Capitalized labour 1,094 1,130
Total labour costs (3,979) (4,199)
Cost of revenues (7,720) (7,705)
Other operating costs (2,111) (1,916)
Total operating costs (13,810) (13,820)
Research and development expense $ 60 $ 66