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Goodwill - Changes in carrying amounts of goodwill (Details) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2025 | Dec. 31, 2024
Reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Goodwill at beginning of period |  | $ 10,261 | $ 10,942
Impairment loss recognised in profit or loss, goodwill | $ (1,132) |  |
Goodwill, end of period |  | 13,231 | 10,261
Cost |  |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Goodwill at beginning of period |  | 11,393 | 10,942
Acquisitions and disposition |  | 2,989 |
Additional recognition, goodwill |  |  | 451
Net foreign exchange differences |  | (19) |
Goodwill, end of period |  | 14,363 | 11,393
Accumulated impairment |  |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Goodwill at beginning of period |  | (1,132) | 0
Impairment loss recognised in profit or loss, goodwill |  |  | (1,132)
Goodwill, end of period |  | (1,132) | (1,132)
Bell CTS |  |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Goodwill at beginning of period |  | 8,266 | 8,099
Goodwill, end of period |  |  | 8,266
Bell CTS | Canadian |  |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Goodwill at beginning of period |  | 8,266 |
Goodwill, end of period |  | 8,286 | 8,266
Bell CTS | Foreign |  |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Goodwill at beginning of period |  | 0 |
Goodwill, end of period |  | 3,003 | 0
Bell CTS | Cost |  |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Goodwill at beginning of period |  | 8,266 | 8,099
Additional recognition, goodwill |  |  | 167
Goodwill, end of period |  |  | 8,266
Bell CTS | Cost | Canadian |  |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Goodwill at beginning of period |  | 8,266 |
Acquisitions and disposition |  | 20 |
Net foreign exchange differences |  | 0 |
Goodwill, end of period |  | 8,286 | 8,266
Bell CTS | Cost | Foreign |  |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Goodwill at beginning of period |  | 0 |
Acquisitions and disposition |  | 3,022 |
Net foreign exchange differences |  | (19) |
Goodwill, end of period |  | 3,003 | 0
Bell CTS | Accumulated impairment |  |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Goodwill at beginning of period |  | 0 | 0
Impairment loss recognised in profit or loss, goodwill |  |  | 0
Goodwill, end of period |  |  | 0
Bell CTS | Accumulated impairment | Canadian |  |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Goodwill at beginning of period |  | 0 |
Goodwill, end of period |  | 0 | 0
Bell CTS | Accumulated impairment | Foreign |  |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Goodwill at beginning of period |  | 0 |
Goodwill, end of period |  | 0 | 0
Bell Media |  |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Goodwill at beginning of period |  | 1,995 | 2,843
Impairment loss recognised in profit or loss, goodwill | $ (1,132) |  |
Goodwill, end of period |  | 1,942 | 1,995
Bell Media | Cost |  |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Goodwill at beginning of period |  | 3,127 | 2,843
Acquisitions and disposition |  | (53) |
Additional recognition, goodwill |  |  | 284
Net foreign exchange differences |  | 0 |
Goodwill, end of period |  | 3,074 | 3,127
Bell Media | Accumulated impairment |  |  |
Reconciliation of changes in intangible assets and goodwill [abstract] |  |  |
Goodwill at beginning of period |  | (1,132) | 0
Impairment loss recognised in profit or loss, goodwill |  |  | (1,132)
Goodwill, end of period |  | $ (1,132) | $ (1,132)

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- Definition Acquisitions Through Business Combinations, Disposals And Increase (Decrease) Through Other Changes, Intangible Assets And Goodwill + References No definition available. + Details
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- Definition The amount of additional goodwill recognised, except goodwill included in a disposal group that, on acquisition, meets the criteria to be classified as held for sale in accordance with IFRS 5. [Refer: Goodwill; Disposal groups classified as held for sale [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2025-01-01 -Paragraph B67 -Subparagraph d -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&anchor=para_B67_d_ii&doctype=Appendix&subtype=B -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 37 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_37_a&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 37 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_37_a&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Total for all business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2025-01-01 -Paragraph 134 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_134_a&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2025-01-01 -Paragraph 135 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_135_a&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2025-01-01 -Paragraph B67 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&anchor=para_B67_d&doctype=Appendix&subtype=B -URIDate 2025-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 254 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_254_a&doctype=Standard -URIDate 2025-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 255 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_255_a&doctype=Standard -URIDate 2025-03-27 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 254 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_254_a&doctype=Standard -URIDate 2025-03-27 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 255 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_255_a&doctype=Standard -URIDate 2025-03-27 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 37 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_37&doctype=Standard -URIDate 2025-03-27 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 37 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_37&doctype=Standard -URIDate 2025-03-27 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 54 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_54_c&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in goodwill resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2025-01-01 -Paragraph B67 -Subparagraph d -Clause vi -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&anchor=para_B67_d_vi&doctype=Appendix&subtype=B -URIDate 2025-03-27 + Details
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