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INVENTORIES (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Inventories [Abstract]    
Wireless devices and accessories $ 399 $ 380
Other finished goods and merchandise 80 80
Total inventories 479 460
Cost of equipment sales and merchandise for resale $ 2,207 $ 2,496