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Impairment of assets (Details) - CAD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Jun. 30, 2021
Dec. 31, 2022
Dec. 31, 2021
Jun. 30, 2022
Disclosure of reconciliation of changes in goodwill [line items]          
Impairment of assets     $ 279 $ 197  
Explanation of period over which management has projected cash flows, period     5 years    
Program and feature film rights          
Disclosure of reconciliation of changes in goodwill [line items]          
Impairment of assets $ 53        
Corporate, non-segment          
Disclosure of reconciliation of changes in goodwill [line items]          
Impairment of assets     $ 132    
BELL MEDIA          
Disclosure of reconciliation of changes in goodwill [line items]          
Impairment of assets $ 147 $ 163      
Cash-generating units          
Disclosure of reconciliation of changes in goodwill [line items]          
Explanation of period over which management has projected cash flows, period 5 years 5 years      
Discount rate 10.30% 8.50% 10.30%    
Perpetuity growth rate   (2.00%)     0.50%
Recoverable amount of asset or cash-generating unit $ 109 $ 235 $ 109    
Indefinite-Lived Intangible Assets | BELL MEDIA          
Disclosure of reconciliation of changes in goodwill [line items]          
Impairment of assets $ 94 150      
Property, plant and equipment | BELL MEDIA          
Disclosure of reconciliation of changes in goodwill [line items]          
Impairment of assets   $ 13