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Segmented information - Segmented Information (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2024
CAD ($)
Dec. 31, 2023
CAD ($)
Dec. 31, 2024
CAD ($)
measure
Dec. 31, 2023
CAD ($)
Disclosure of operating segments [line items]        
Operating revenues     $ 24,409 $ 24,673
Operating costs     (13,820) (14,256)
Adjusted EBITDA     10,589 10,417
Severance, acquisition and other costs     (454) (200)
Depreciation and amortization     (5,041) (4,918)
Finance costs        
Interest expense     (1,713) (1,475)
Net return on post-employment benefit plans     66 108
Impairment of assets     (2,190) (143)
Other expense     (305) (466)
Income taxes     (577) (996)
Net earnings     375 2,327
Goodwill   $ 10,942 10,261 10,942
Indefinite-life intangible assets   9,815 9,742 9,815
Capital expenditures     $ 3,897 4,581
Number of measures of profit to make decisions | measure     1  
External service revenues        
Disclosure of operating segments [line items]        
Operating revenues     $ 24,409 24,673
Inter-segment service revenues        
Disclosure of operating segments [line items]        
Operating revenues     0 0
Operating Service        
Disclosure of operating segments [line items]        
Operating revenues     21,073 21,154
Operating Service | External service revenues        
Disclosure of operating segments [line items]        
Operating revenues     21,073 21,154
Operating Service | Inter-segment service revenues        
Disclosure of operating segments [line items]        
Operating revenues     0 0
Total products        
Disclosure of operating segments [line items]        
Operating revenues     3,336 3,519
Bell Media        
Finance costs        
Impairment of assets $ (958) (86)    
Operating segments | Bell CTS        
Disclosure of operating segments [line items]        
Operating revenues     21,619 21,926
Operating costs     (11,788) (12,206)
Adjusted EBITDA     9,831 9,720
Finance costs        
Goodwill   8,099 8,266 8,099
Indefinite-life intangible assets   8,052 8,611 8,052
Capital expenditures     3,746 4,421
Operating segments | Bell CTS | External service revenues        
Disclosure of operating segments [line items]        
Operating revenues     21,592 21,897
Operating segments | Bell CTS | Inter-segment service revenues        
Disclosure of operating segments [line items]        
Operating revenues     27 29
Operating segments | Bell CTS | Operating Service        
Disclosure of operating segments [line items]        
Operating revenues     18,283 18,407
Operating segments | Bell CTS | Operating Service | External service revenues        
Disclosure of operating segments [line items]        
Operating revenues     18,256 18,378
Operating segments | Bell CTS | Operating Service | Inter-segment service revenues        
Disclosure of operating segments [line items]        
Operating revenues     27 29
Operating segments | Bell CTS | Total products        
Disclosure of operating segments [line items]        
Operating revenues     3,336 3,519
Operating segments | Bell Media        
Disclosure of operating segments [line items]        
Operating revenues     3,151 3,117
Operating costs     (2,393) (2,420)
Adjusted EBITDA     758 697
Finance costs        
Goodwill   2,843 1,995 2,843
Indefinite-life intangible assets   1,763 1,131 1,763
Capital expenditures     151 160
Operating segments | Bell Media | External service revenues        
Disclosure of operating segments [line items]        
Operating revenues     2,817 2,776
Operating segments | Bell Media | Inter-segment service revenues        
Disclosure of operating segments [line items]        
Operating revenues     334 341
Operating segments | Bell Media | Operating Service        
Disclosure of operating segments [line items]        
Operating revenues     3,151 3,117
Operating segments | Bell Media | Operating Service | External service revenues        
Disclosure of operating segments [line items]        
Operating revenues     2,817 2,776
Operating segments | Bell Media | Operating Service | Inter-segment service revenues        
Disclosure of operating segments [line items]        
Operating revenues     334 341
Operating segments | Bell Media | Total products        
Disclosure of operating segments [line items]        
Operating revenues     0 0
Inter-segment eliminations        
Disclosure of operating segments [line items]        
Operating revenues     (361) (370)
Operating costs     361 370
Adjusted EBITDA     0 0
Finance costs        
Goodwill   0 0 0
Indefinite-life intangible assets   $ 0 0 0
Capital expenditures     0 0
Inter-segment eliminations | External service revenues        
Disclosure of operating segments [line items]        
Operating revenues     0 0
Inter-segment eliminations | Inter-segment service revenues        
Disclosure of operating segments [line items]        
Operating revenues     (361) (370)
Inter-segment eliminations | Operating Service        
Disclosure of operating segments [line items]        
Operating revenues     (361) (370)
Inter-segment eliminations | Operating Service | External service revenues        
Disclosure of operating segments [line items]        
Operating revenues     0 0
Inter-segment eliminations | Operating Service | Inter-segment service revenues        
Disclosure of operating segments [line items]        
Operating revenues     (361) (370)
Inter-segment eliminations | Total products        
Disclosure of operating segments [line items]        
Operating revenues     $ 0 $ 0