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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

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