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Operating costs (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Labour costs    
Wages, salaries and related taxes and benefits $ (4,250) $ (4,233)
Post-employment benefit plans service cost (net of capitalized amounts) (249) (266)
Other labour costs (1,054) (1,016)
Less:    
Capitalized labour 1,136 1,068
Total labour costs (4,417) (4,447)
Cost of revenues (7,641) (7,284)
Other operating costs (1,917) (1,825)
Total operating costs (13,975) (13,556)
Research and development expense $ 57 $ 57