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Assets and liabilities held for sale - Narrative (Details)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2025
CAD ($)
Oct. 04, 2024
CAD ($)
advertising_display
Jun. 30, 2025
CAD ($)
Dec. 31, 2024
CAD ($)
Dec. 31, 2023
CAD ($)
Feb. 08, 2024
radio_station
Disclosure of financial assets [line items]            
Number of radio stations held for sale | radio_station           45
Gain (losses) on disposals of investments       $ 57 $ 80  
Number of advertising displays to be disposed | advertising_display   669        
Estimated proceeds from disposition of advertising displays   $ 14        
Share of profit (loss) of associates and joint ventures accounted for using equity method, operations       10 28  
MSLE            
Disclosure of financial assets [line items]            
Assets (liabilities)       (493)    
Share of profit (loss) of associates and joint ventures accounted for using equity method, operations       6    
Profit (loss) from discontinued operations         25  
Assets and liabilities classified as held for sale            
Disclosure of financial assets [line items]            
Revenue       35 39  
Assets (liabilities)       (449) 45  
Assets and liabilities classified as held for sale | MSLE            
Disclosure of financial assets [line items]            
Assets (liabilities)       $ 493 $ 0  
Forecast            
Disclosure of financial assets [line items]            
Proceeds from sale     $ 54      
Gain (losses) on disposals of investments     $ 9      
Forecast | MSLE            
Disclosure of financial assets [line items]            
Proceeds from sale $ 4,700          
Gain recognised on disposal of assets or disposal groups constituting discontinued operation $ 5,200