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Operating costs (Details) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Labour costs        
Wages, salaries and related taxes and benefits $ (1,085) $ (1,071) $ (2,125) $ (2,104)
Post-employment benefit plans service cost (net of capitalized amounts) (59) (63) (128) (137)
Other labour costs (247) (258) (484) (504)
Less:        
Capitalized labour 283 270 543 525
Total labour costs (1,108) (1,122) (2,194) (2,220)
Cost of revenues (1,694) (1,663) (3,422) (3,403)
Other operating costs (469) (437) (921) (876)
Total operating costs $ (3,271) $ (3,222) $ (6,537) $ (6,499)