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INTANGIBLE ASSETS AND GOODWILL - Overview of methods and key assumptions used to determine recoverable amounts for CGUs (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of information for cash-generating units [line items]    
Carrying value of goodwill $ 3,973 $ 3,923
Operating segments | Wireless    
Disclosure of information for cash-generating units [line items]    
Carrying value of goodwill 1,160 1,160
Carrying value of indefinite-life intangible assets $ 8,465  
Period of projected cash flows (years) 5 years  
Terminal growth rates (%) 0.50%  
Pre-tax discount rates (%) 8.40%  
Operating segments | Cable    
Disclosure of information for cash-generating units [line items]    
Carrying value of goodwill $ 1,858 1,808
Carrying value of indefinite-life intangible assets $ 0  
Period of projected cash flows (years) 5 years  
Terminal growth rates (%) 1.50%  
Pre-tax discount rates (%) 7.80%  
Operating segments | Media    
Disclosure of information for cash-generating units [line items]    
Carrying value of goodwill $ 955 $ 955
Carrying value of indefinite-life intangible assets $ 235  
Period of projected cash flows (years) 5 years  
Terminal growth rates (%) 2.00%  
Pre-tax discount rates (%) 9.60%