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Impairment of assets (Details) - CAD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Disclosure of reconciliation of changes in goodwill [line items]      
Impairment of assets   $ 472 $ 102
Explanation of period over which management has projected cash flows, period   5 years  
BELL MEDIA      
Disclosure of reconciliation of changes in goodwill [line items]      
Impairment of assets $ 452    
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 (as a percent)     7.50%
Perpetuity Growth Rate (as a percent)     0.00%
Recoverable amount of asset or cash-generating unit $ 942   $ 464
Cash-generating units | Minimum      
Disclosure of reconciliation of changes in goodwill [line items]      
Discount Rate (as a percent) 8.00%    
Perpetuity Growth Rate (as a percent) (1.00%)    
Cash-generating units | Maximum      
Disclosure of reconciliation of changes in goodwill [line items]      
Discount Rate (as a percent) 9.50%    
Perpetuity Growth Rate (as a percent) 0.00%    
Indefinite-Lived Intangible Assets      
Disclosure of reconciliation of changes in goodwill [line items]      
Impairment of assets     85
Indefinite-Lived Intangible Assets | BELL MEDIA      
Disclosure of reconciliation of changes in goodwill [line items]      
Impairment of assets $ 291    
Finite-Lived Intangible Assets | BELL MEDIA      
Disclosure of reconciliation of changes in goodwill [line items]      
Impairment of assets 146    
Property, plant and equipment      
Disclosure of reconciliation of changes in goodwill [line items]      
Impairment of assets     $ 8
Property, plant and equipment | BELL MEDIA      
Disclosure of reconciliation of changes in goodwill [line items]      
Impairment of assets $ 15