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OPERATING COSTS (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Operating Costs [Abstract]    
Cost of equipment sales $ 2,254 $ 2,284
Merchandise for resale 242 231
Other external purchases 4,360 4,509
Employee salaries, benefits, and stock-based compensation 2,005 2,089
Total operating costs $ 8,861 $ 9,113