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INTANGIBLE ASSETS AND GOODWILL - Changes in net carrying amounts of intangible assets and goodwill (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in intangible assets and goodwill [abstract]    
Net carrying amount $ 12,828 $ 11,110
Net additions 159 1,811
Amortization (88) (93)
Net carrying amount 12,899 12,828
Customer relationships    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Net carrying amount 33 47
Net additions 12 2
Amortization (11) (16)
Net carrying amount 34 33
Intangible assets excluding goodwill and acquired program rights    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Net carrying amount 8,734 7,017
Net additions 52 1,733
Amortization (11) (16)
Net carrying amount 8,775 8,734
Acquired program rights    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Net carrying amount 171 188
Net additions 57 60
Amortization (77) (77)
Net carrying amount 151 171
Goodwill    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Net carrying amount 3,923 3,905
Net additions 50 18
Amortization 0 0
Net carrying amount 3,973 3,923
Total intangible assets    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Net carrying amount 8,905 7,205
Net additions 109 1,793
Amortization (88) (93)
Net carrying amount 8,926 8,905
Spectrum licences    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Net carrying amount 8,331 6,600
Net additions 40 1,731
Amortization 0 0
Net carrying amount 8,371 8,331
Broadcast licences    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Net carrying amount 234 234
Net additions 0 0
Amortization 0 0
Net carrying amount 234 234
Brand names    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Net carrying amount 136 136
Net additions 0 0
Amortization 0 0
Net carrying amount $ 136 $ 136