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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, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure of information for cash-generating units [line items]      
Carrying value of goodwill $ 3,923 $ 3,905 $ 3,905
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 $ 1,808   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   $ 937
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 (%) 9.80%