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Intangible assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance $ 13,352 $ 13,205
Ending balance 13,102 13,352
Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Ending balance 227  
COST    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 21,765 20,850
Additions 1,375 1,396
Acquired through business combinations 11 6
Transfers 810 657
Retirements and disposals (2,515) (69)
Impairment losses recognized in earnings (445) (87)
Amortization (845) (992)
Ending balance 19,859 21,765
COST | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations (297) 4
ACCUMULATED AMORTIZATION    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance (8,413) (7,645)
Retirements and disposals (2,517) (65)
Amortization 929 (886)
Other   (69)
Ending balance (6,757) (8,413)
ACCUMULATED AMORTIZATION | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations (68) 16
BRANDS    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 2,409 2,409
Ending balance 2,409 2,409
BRANDS | COST    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 2,409 2,409
Additions 0 0
Acquired through business combinations 0 0
Transfers 0 0
Retirements and disposals 0 0
Impairment losses recognized in earnings 0 0
Amortization 0 0
Ending balance 2,409 2,409
BRANDS | COST | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations 0 0
BRANDS | ACCUMULATED AMORTIZATION    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 0 0
Retirements and disposals 0 0
Amortization 0 0
Other   0
Ending balance 0 0
BRANDS | ACCUMULATED AMORTIZATION | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations 0 0
SPECTRUM AND OTHER LICENCES    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 3,586 3,587
Ending balance 3,701 3,586
SPECTRUM AND OTHER LICENCES | COST    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 3,586 3,587
Additions 116 0
Acquired through business combinations 0 0
Transfers 0 0
Retirements and disposals 0 0
Impairment losses recognized in earnings (1) (1)
Amortization 0 0
Ending balance 3,701 3,586
SPECTRUM AND OTHER LICENCES | COST | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations 0 0
SPECTRUM AND OTHER LICENCES | ACCUMULATED AMORTIZATION    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 0 0
Retirements and disposals 0 0
Amortization 0 0
Other   0
Ending balance 0 0
SPECTRUM AND OTHER LICENCES | ACCUMULATED AMORTIZATION | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations 0 0
BROADCAST LICENCES    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 2,026 2,111
Ending balance 1,730 2,026
BROADCAST LICENCES | COST    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 2,026 2,111
Additions 0 0
Acquired through business combinations 0 0
Transfers 0 0
Retirements and disposals 0 0
Impairment losses recognized in earnings (296) (85)
Amortization 0 0
Ending balance 1,730 2,026
BROADCAST LICENCES | COST | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations 0 0
BROADCAST LICENCES | ACCUMULATED AMORTIZATION    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 0 0
Retirements and disposals 0 0
Amortization 0 0
Other   0
Ending balance 0 0
BROADCAST LICENCES | ACCUMULATED AMORTIZATION | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations 0 0
TOTAL    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 8,021 8,107
Ending balance 7,840 8,021
TOTAL | COST    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 8,021 8,107
Additions 116 0
Acquired through business combinations 0 0
Transfers 0 0
Retirements and disposals 0 0
Impairment losses recognized in earnings (297) (86)
Amortization 0 0
Ending balance 7,840 8,021
TOTAL | COST | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations 0 0
TOTAL | ACCUMULATED AMORTIZATION    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 0 0
Retirements and disposals 0 0
Amortization 0 0
Other   0
Ending balance 0 0
TOTAL | ACCUMULATED AMORTIZATION | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations 0 0
SOFTWARE    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 3,177 2,805
Ending balance 3,525 3,177
SOFTWARE | COST    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 10,522 9,525
Additions 344 388
Acquired through business combinations 1 0
Transfers 810 657
Retirements and disposals (2,479) (52)
Impairment losses recognized in earnings (13) 0
Amortization 0 0
Ending balance 9,169 10,522
SOFTWARE | COST | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations (16) 4
SOFTWARE | ACCUMULATED AMORTIZATION    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance (7,345) (6,720)
Retirements and disposals (2,480) (51)
Amortization 787 (743)
Other   (69)
Ending balance (5,644) (7,345)
SOFTWARE | ACCUMULATED AMORTIZATION | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations (8) 2
CUSTOMER RELATION- SHIPS    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 1,178 1,287
Ending balance 858 1,178
CUSTOMER RELATION- SHIPS | COST    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 2,017 2,014
Additions 0 0
Acquired through business combinations 0 6
Transfers 0 0
Retirements and disposals 0 (3)
Impairment losses recognized in earnings 0 0
Amortization 0 0
Ending balance 1,736 2,017
CUSTOMER RELATION- SHIPS | COST | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations (281) 0
CUSTOMER RELATION- SHIPS | ACCUMULATED AMORTIZATION    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance (839) (727)
Retirements and disposals 0 0
Amortization 99 (98)
Other   0
Ending balance (878) (839)
CUSTOMER RELATION- SHIPS | ACCUMULATED AMORTIZATION | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations (60) 14
PROGRAM AND FEATURE FILM RIGHTS    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 716 704
Ending balance 645 716
PROGRAM AND FEATURE FILM RIGHTS | COST    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 716 704
Additions 874 1,004
Acquired through business combinations 10 0
Transfers 0 0
Retirements and disposals 0 0
Impairment losses recognized in earnings (110) 0
Amortization (845) (992)
Ending balance 645 716
PROGRAM AND FEATURE FILM RIGHTS | COST | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations 0 0
PROGRAM AND FEATURE FILM RIGHTS | ACCUMULATED AMORTIZATION    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 0 0
Retirements and disposals 0 0
Amortization 0 0
Other   0
Ending balance 0 0
PROGRAM AND FEATURE FILM RIGHTS | ACCUMULATED AMORTIZATION | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations 0 0
OTHER    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 260 302
Ending balance 234 260
OTHER | COST    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 489 500
Additions 41 4
Acquired through business combinations 0 0
Transfers 0 0
Retirements and disposals (36) (14)
Impairment losses recognized in earnings (25) (1)
Amortization 0 0
Ending balance 469 489
OTHER | COST | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations 0 0
OTHER | ACCUMULATED AMORTIZATION    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance (229) (198)
Retirements and disposals (37) (14)
Amortization 43 (45)
Other   0
Ending balance (235) (229)
OTHER | ACCUMULATED AMORTIZATION | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations 0 0
TOTAL    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 5,331 5,098
Ending balance 5,262 5,331
TOTAL | COST    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance 13,744 12,743
Additions 1,259 1,396
Acquired through business combinations 11 6
Transfers 810 657
Retirements and disposals (2,515) (69)
Impairment losses recognized in earnings (148) (1)
Amortization (845) (992)
Ending balance 12,019 13,744
TOTAL | COST | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations (297) 4
TOTAL | ACCUMULATED AMORTIZATION    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Beginning balance (8,413) (7,645)
Retirements and disposals (2,517) (65)
Amortization 929 (886)
Other   (69)
Ending balance (6,757) (8,413)
TOTAL | ACCUMULATED AMORTIZATION | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations $ (68) $ 16