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Business acquisitions and disposition - Narrative (Details) - CAD ($)
$ in Millions
 1 Months Ended 7 Months Ended 10 Months Ended 12 Months Ended
May 03, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Jun. 01, 2023
Dec. 01, 2022
Feb. 28, 2022
Disclosure of detailed information about business combination [line items]                    
Cash transferred, net of cash acquired               $ 156    
Consideration payable, term               2 years    
Business acquisition, contingent consideration, liability     $ 0     $ 0        
FX Innovation                    
Disclosure of detailed information about business combination [line items]                    
Consideration recognized as of acquisition date               $ 157    
Cash consideration payable               12    
Contingent consideration recognised as of acquisition date               6    
Contingent consideration, maximum amount payable               7    
Revenue of acquiree since acquisition date     50              
Revenue of combined entity as if combination occurred at beginning of period           24,715        
Cash consideration paid               $ 145    
Distributel                    
Disclosure of detailed information about business combination [line items]                    
Cash transferred, net of cash acquired                 $ 282  
Contingent consideration recognised as of acquisition date                 39  
Business acquisition, contingent consideration, liability     $ 49     49        
Contingent consideration, maximum amount payable                 65  
Revenue of acquiree since acquisition date   $ 14                
Revenue of combined entity as if combination occurred at beginning of period             $ 24,309      
Payment for contingent consideration, liability           $ 19        
Cash consideration paid                 $ 303  
Distributel | Forecast                    
Disclosure of detailed information about business combination [line items]                    
Payment for contingent consideration, liability         $ 30          
EBOX                    
Disclosure of detailed information about business combination [line items]                    
Revenue of acquiree since acquisition date       $ 41            
Cash consideration paid                   $ 153
Financial assets recognised as of acquisition date                   $ 139
Production Studios                    
Disclosure of detailed information about business combination [line items]                    
Proportion of ownership interests sold 63.00%         63.00%        
Proceeds from sale of operations $ 211         $ 211        
Gain recognised on disposal of assets or disposal groups constituting discontinued operation 79         $ 79        
Tax expense recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation $ 17