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INTANGIBLE ASSETS AND GOODWILL - Explanatory information about intangible assets and goodwill (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill $ 12,899 $ 12,828 $ 11,110
Cost prior to impairment losses      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill 15,174 15,092 13,339
Accumulated amortization      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill (1,936) (1,925) (1,890)
Accumulated impairment losses      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill (339) (339) (339)
Customer relationships      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill 34 33 47
Customer relationships | Cost prior to impairment losses      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill 1,623 1,611 1,609
Customer relationships | Accumulated amortization      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill (1,589) (1,578) (1,562)
Customer relationships | Accumulated impairment losses      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill 0 0 0
Acquired program rights      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill 151 171 188
Acquired program rights | Cost prior to impairment losses      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill 233 253 251
Acquired program rights | Accumulated amortization      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill (77) (77) (58)
Acquired program rights | Accumulated impairment losses      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill (5) (5) (5)
Goodwill      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill 3,973 3,923 3,905
Goodwill | Cost prior to impairment losses      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill 4,194 4,144 4,126
Goodwill | Accumulated amortization      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill 0 0 0
Goodwill | Accumulated impairment losses      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill (221) (221) (221)
Total intangible assets      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill 8,926 8,905 7,205
Total intangible assets | Cost prior to impairment losses      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill 10,980 10,948 9,213
Total intangible assets | Accumulated amortization      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill (1,936) (1,925) (1,890)
Total intangible assets | Accumulated impairment losses      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill (118) (118) (118)
Spectrum licences      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill 8,371 8,331 6,600
Spectrum licences | Cost prior to impairment losses      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill 8,371 8,331 6,600
Spectrum licences | Accumulated amortization      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill 0 0 0
Spectrum licences | Accumulated impairment losses      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill 0 0 0
Broadcast licences      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill 234 234 234
Broadcast licences | Cost prior to impairment losses      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill 333 333 333
Broadcast licences | Accumulated amortization      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill 0 0 0
Broadcast licences | Accumulated impairment losses      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill (99) (99) (99)
Brand names      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill 136 136 136
Brand names | Cost prior to impairment losses      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill 420 420 420
Brand names | Accumulated amortization      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill (270) (270) (270)
Brand names | Accumulated impairment losses      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill $ (14) $ (14) $ (14)