v3.25.4
Assets and liabilities held for sale - Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2025
CAD ($)
Jul. 01, 2025
CAD ($)
Apr. 30, 2025
CAD ($)
advertising_display
Dec. 31, 2025
CAD ($)
Jun. 30, 2026
CAD ($)
Dec. 31, 2027
CAD ($)
Dec. 31, 2025
CAD ($)
Dec. 31, 2024
CAD ($)
Oct. 01, 2025
CAD ($)
Jun. 30, 2025
radio_station
Oct. 04, 2024
advertising_display
Disclosure of financial assets [line items]                      
Number of advertising displays disposed | advertising_display     669                
Operations             $ 8 $ 10      
Bell Media radio stations                      
Disclosure of financial assets [line items]                      
Number of radio stations held for sale | radio_station                   45  
Proceeds from sale of operations $ 44                    
Bell Media radio stations | Other gains (losses)                      
Disclosure of financial assets [line items]                      
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation 3                    
Bell Media radio stations | Gains (losses) on fair value adjustment, investment                      
Disclosure of financial assets [line items]                      
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation (6)                    
Bell Media radio stations | Assets and liabilities classified as held for sale                      
Disclosure of financial assets [line items]                      
Revenue             9 35      
Bell Media radio stations | Forecast                      
Disclosure of financial assets [line items]                      
Proceeds from sale of operations         $ 53            
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation         $ 6            
OUTEDGE advertising displays | Assets and liabilities classified as held for sale                      
Disclosure of financial assets [line items]                      
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation     $ 4                
Number of advertising displays disposed | advertising_display                     669
Proceeds from disposition of advertising displays     $ 14                
Home Security and Monitored Alarm Assets | Assets and liabilities classified as held for sale                      
Disclosure of financial assets [line items]                      
Proceeds from sale of operations       $ 65     65        
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation             57        
Revenue             48 69      
Total proceeds from sale of operations 170     170     170   $ 170    
Home Security and Monitored Alarm Assets | Forecast | Assets and liabilities classified as held for sale                      
Disclosure of financial assets [line items]                      
Additional proceeds from disposal of non-current assets to be received upon contingent consideration           $ 25          
Home Security and Monitored Alarm Assets | Forecast | Assets and liabilities classified as held for sale | Top of range                      
Disclosure of financial assets [line items]                      
Additional proceeds from disposal of non-current assets to be received upon contingent consideration           $ 80          
MSLE                      
Disclosure of financial assets [line items]                      
Proceeds from sale of operations             4,700        
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation             5,200        
Income tax liability   $ 542         542        
MSLE | Disposal of major subsidiary [member]                      
Disclosure of financial assets [line items]                      
Proceeds from sale of operations   $ 4,700                  
MSLE | Assets and liabilities classified as held for sale                      
Disclosure of financial assets [line items]                      
Liabilities included in disposal groups classified as held for sale $ 0     $ 0     $ 0 493      
Operations               $ 6