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Goodwill - Changes in carrying amounts of goodwill (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in intangible assets and goodwill [abstract]    
Goodwill at beginning of period $ 10,572  
Goodwill, end of period 10,906 $ 10,572
BELL WIRELESS    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Goodwill, end of period 3,046  
BELL WIRELINE    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Goodwill, end of period 4,914  
BELL MEDIA    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Goodwill, end of period 2,946  
Goodwill    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Goodwill at beginning of period   10,604
Acquisitions and other 334 (26)
Reclassified to assets held for sale   (6)
Goodwill, end of period 10,906  
Goodwill | BELL WIRELESS    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Goodwill at beginning of period 3,046 3,046
Acquisitions and other 0 0
Reclassified to assets held for sale   0
Goodwill, end of period   3,046
Goodwill | BELL WIRELINE    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Goodwill at beginning of period 4,580 4,612
Acquisitions and other 334 (26)
Reclassified to assets held for sale   (6)
Goodwill, end of period   4,580
Goodwill | BELL MEDIA    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Goodwill at beginning of period 2,946 2,946
Acquisitions and other $ 0 0
Reclassified to assets held for sale   0
Goodwill, end of period   $ 2,946