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Impairment of assets (Details) - CAD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of changes in goodwill [line items]        
Impairment of assets     $ 143,000,000 $ 279,000,000
Impairment loss recognised in profit or loss, property, plant and equipment     $ 57,000,000 132,000,000
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 $ 45,000,000 $ 53,000,000    
BELL MEDIA        
Disclosure of reconciliation of changes in goodwill [line items]        
Impairment of assets $ 86,000,000 $ 147,000,000    
Impairment loss recognised in profit or loss, goodwill     $ 0 $ 0
Cash-generating units        
Disclosure of reconciliation of changes in goodwill [line items]        
Discount rate 9.50% 10.30% 9.50% 10.30%
Perpetuity growth rate 0.00% 0.50% 0.00% 0.50%
Recoverable amount of asset or cash-generating unit $ 62,000,000 $ 109,000,000 $ 62,000,000 $ 109,000,000
Explanation of period over which management has projected cash flows, period   5 years    
Indefinite-Lived Intangible Assets | BELL MEDIA        
Disclosure of reconciliation of changes in goodwill [line items]        
Impairment of assets $ 41,000,000 $ 94,000,000