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Goodwill - Narrative (Details) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2025
Disclosure of reconciliation of changes in goodwill [line items] |  |
Impairment loss recognised in profit or loss, goodwill | $ 1,132 |
Explanation of period over which management has projected cash flows, period |  | 5 years
Bell Media |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |
Decrease in growth rate used to extrapolate cash flow projections |  | 2.10%
Increase in discount rate applied to cash flow projections |  | 1.20%
Bell CTS | U.S. |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |
Decrease in growth rate used to extrapolate cash flow projections |  | 1.20%
Increase in discount rate applied to cash flow projections |  | 1.00%
Bell Media |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |
Impairment loss recognised in profit or loss, goodwill | $ 1,132 |

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