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Operating costs (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Labour costs    
Wages, salaries and related taxes and benefits $ (4,108) $ (4,281)
Post-employment benefit plans service cost (net of capitalized amounts) (269) (246)
Other labour costs (975) (1,004)
Less:    
Capitalized labour 1,007 1,028
Employee Benefits Expense, Excluding Termination (4,345) (4,503)
Cost of revenues (6,967) (7,356)
Other operating costs (1,964) (1,928)
Total operating costs (13,276) (13,787)
Research and development expense $ 47 $ 109