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Severance, acquisition and other costs (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Disclosure Of Severance, Acquisition And Other Costs [Line Items] |  |
Severance | $ (380) | $ (383)
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination and other costs | (137) | (71)
Total severance, acquisition and other costs | (517) | $ (454)
Ziply Fiber |  |
Disclosure Of Severance, Acquisition And Other Costs [Line Items] |  |
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination and other costs | $ (67) |

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- Details
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