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REVENUE - Disaggregation of Revenue (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue $ 15,096 $ 14,369
Operating segments | Wireless    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 9,200 8,569
Operating segments | Wireless | Service revenue    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 7,091 6,765
Operating segments | Wireless | Equipment revenue    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 2,109 1,804
Operating segments | Cable    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 3,932 3,894
Operating segments | Cable | Service revenue    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 3,919 3,879
Operating segments | Cable | Equipment revenue    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 13 15
Operating segments | Cable | Internet    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 2,114 1,967
Operating segments | Cable | Television    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 1,442 1,501
Operating segments | Cable | Phone    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 363 411
Operating segments | Total Media    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 2,168 2,153
Corporate items and intercompany eliminations    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue $ (204) $ (247)