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Goodwill - Changes in carrying amounts of goodwill (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of changes in intangible assets and goodwill [abstract]    
Goodwill at beginning of period $ 10,906  
Goodwill, end of period 10,942 $ 10,906
Goodwill    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Goodwill at beginning of period 10,906 10,572
Acquisitions   334
Acquisitions, disposition and other 58  
Reclassified to assets held for sale (22)  
Goodwill, end of period 10,942 10,906
Goodwill | BELL CTS    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Goodwill at beginning of period 7,960 7,626
Acquisitions   334
Acquisitions, disposition and other 139  
Reclassified to assets held for sale 0  
Goodwill, end of period 8,099 7,960
Goodwill | BELL MEDIA    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Goodwill at beginning of period 2,946 2,946
Acquisitions   0
Acquisitions, disposition and other (81)  
Reclassified to assets held for sale (22)  
Goodwill, end of period $ 2,843 $ 2,946