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Operating costs (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Labour costs    
Wages, salaries and related taxes and benefits $ (4,134) $ (4,354)
Post-employment benefit plans service cost (net of capitalized amounts) (208) (206)
Other labour costs (987) (1,063)
Less:    
Capitalized labour 1,130 1,217
Total labour costs (4,199) (4,406)
Cost of revenues (7,705) (7,926)
Other operating costs (1,916) (1,924)
Total operating costs (13,820) (14,256)
Research and development expense $ 66 $ 90