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Impairment of assets (Details) - CAD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Impairment of assets |  |  | $ 2,190,000,000 | $ 143,000,000
Impairment loss recognised in profit or loss, goodwill | $ 1,132,000,000 |  |  |
Impairment losses recognized in earnings |  |  | $ 100,000,000 | $ 57,000,000
Total for all cash-generating units |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Discount rate |  | 9.50% |  | 9.50%
Perpetuity growth rate |  | 0.00% |  | 0.00%
Recoverable amount of asset or cash-generating unit | $ 811,000,000 | $ 62,000,000 |  | $ 62,000,000
Minimum | Total for all cash-generating units |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Discount rate | 9.00% |  |  |
Perpetuity growth rate | (2.00%) |  |  |
Maximum | Total for all cash-generating units |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Discount rate | 11.00% |  |  |
Perpetuity growth rate | 0.00% |  |  |
Bell Media |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Impairment of assets | $ 958,000,000 | 86,000,000 |  |
Impairment loss recognised in profit or loss, goodwill | 1,132,000,000 |  |  | $ 0
Bell Media | Property, plant and equipment |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Impairment of assets | 85,000,000 |  |  |
Bell Media | Prepaid expenses |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Impairment of assets | 7,000,000 |  |  |
Bell Media | Program and feature film rights |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Impairment of assets | 144,000,000 | 45,000,000 |  |
Bell Media | Software |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Impairment of assets | 85,000,000 |  |  |
Bell Media | Trademarks |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Impairment of assets | 10,000,000 |  |  |
Bell Media | Indefinite-Lived Intangible Assets |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Impairment of assets | $ 627,000,000 | $ 41,000,000 |  |

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- Definition The growth rate used to extrapolate cash flow projections beyond the period covered by the most recent budgets/forecasts for a cash-generating unit (group of units). [Refer: Total for all cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2024-01-01 -Paragraph 134 -Subparagraph d -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2024-en-r&anchor=para_134_d_iv&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2024-01-01 -Paragraph 134 -Subparagraph e -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2024-en-r&anchor=para_134_e_iv&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2024-01-01 -Paragraph 130 -Subparagraph d -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2024-en-r&anchor=para_130_d_ii&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2024-01-01 -Paragraph 130 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2024-en-r&anchor=para_130_b&doctype=Standard -URIDate 2024-03-27 + Details
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