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Impairment of assets (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disclosure of reconciliation of changes in goodwill [line items]        
Impairment of assets $ 106 $ 164 $ 108 $ 167
BELL MEDIA        
Disclosure of reconciliation of changes in goodwill [line items]        
Impairment of assets       $ 163
Cash-generating units        
Disclosure of reconciliation of changes in goodwill [line items]        
Explanation of period over which management has projected cash flows   5 years    
Discount rate applied to cash flow projections   8.50%   8.50%
Growth rate used to extrapolate cash flow projections   (2.00%)   (2.00%)
Recoverable amount of asset or cash-generating unit   $ 235   $ 235
Indefinite-lived intangible assets | BELL MEDIA        
Disclosure of reconciliation of changes in goodwill [line items]        
Impairment of assets       150
Property, plant and equipment | BELL MEDIA        
Disclosure of reconciliation of changes in goodwill [line items]        
Impairment of assets       $ 13