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INVENTORIES (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Inventories [Abstract]      
Wireless devices and accessories $ 380 $ 399  
Other finished goods and merchandise 80 67  
Total inventories 460 466 $ 466
Cost of equipment sales and merchandise for resale $ 2,496 $ 2,515