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Goodwill - Changes in Carrying Amounts of Goodwill (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill $ 10,604 $ 10,667
Discontinued operations    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill 115  
BELL WIRELESS    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill 3,046 3,046
BELL WIRELINE    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill 4,612 4,675
BELL MEDIA    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill 2,946 2,946
Goodwill    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill 10,604 10,667
Reconciliation of changes in intangible assets and goodwill [abstract]    
Goodwill, beginning of period   10,658
Acquisitions and other 52 9
Goodwill | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations (115)  
Goodwill | BELL WIRELESS    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill 3,046 3,046
Reconciliation of changes in intangible assets and goodwill [abstract]    
Goodwill, beginning of period   3,046
Acquisitions and other 0 0
Goodwill | BELL WIRELESS | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations 0  
Goodwill | BELL WIRELINE    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill 4,612 4,675
Reconciliation of changes in intangible assets and goodwill [abstract]    
Goodwill, beginning of period   4,681
Acquisitions and other 52 (6)
Goodwill | BELL WIRELINE | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations (115)  
Goodwill | BELL MEDIA    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill 2,946  
Reconciliation of changes in intangible assets and goodwill [abstract]    
Goodwill, beginning of period   2,931
Acquisitions and other 0 $ 15
Goodwill | BELL MEDIA | Discontinued operations    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Discontinued operations $ 0