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Goodwill - Narrative (Details) - CAD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Impairment loss recognised in profit or loss, goodwill | $ 1,132,000,000 |  |
Explanation of period over which management has projected cash flows, period |  | 5 years |
Bell Media |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Impairment loss recognised in profit or loss, goodwill | $ 1,132,000,000 |  | $ 0

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