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Business acquisitions and dispositions - Summary of Fair Value of Consideration From Ziply Fiber Acquisition (Details) $ in Millions, $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 01, 2025 CAD ($) | Jul. 30, 2025 CAD ($) | Jul. 30, 2025 USD ($) | Jun. 25, 2025 USD ($) | Dec. 31, 2025 CAD ($) | Dec. 31, 2024 CAD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Gains (losses) on change in fair value of derivatives |  |  |  |  | $ (9) | $ (269)
Ziply Fiber |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Cash advances to related party, maximum amount |  |  |  | $ 150 |  |
Cash advances and loans from related parties |  | $ 103 | $ 75 |  |  |
Ziply Fiber |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Cash transferred | $ 5,013 |  |  |  |  |
Deemed settlement of loan | 103 |  |  |  |  |
Total cost to be allocated | 5,116 |  |  |  |  |
Trade and other receivables | 96 |  |  |  |  |
Prepaid expenses | 43 |  |  |  |  |
Property, plant and equipment | 3,945 |  |  |  |  |
Finite-life intangible assets | 873 |  |  |  |  |
Indefinite-life intangible assets | 263 |  |  |  |  |
Post-employment benefit assets | 20 |  |  |  |  |
Trade payables and other liabilities | (207) |  |  |  |  |
Contract liabilities | (44) |  |  |  |  |
Debt due within one year | (3) |  |  |  |  |
Long-term debt | (2,754) |  |  |  |  |
Deferred tax liabilities | (257) |  |  |  |  |
Post-employment benefit obligations | (43) |  |  |  |  |
Other non-current liabilities | (4) |  |  |  |  |
Identifiable assets acquired (liabilities assumed), excluding cash and cash equivalents and goodwill | 1,928 |  |  |  |  |
Cash and cash equivalents | 166 |  |  |  |  |
Fair value of net assets acquired | 2,094 |  |  |  |  |
Goodwill | 3,022 |  |  |  |  |
Gains (losses) on change in fair value of derivatives | 7 |  |  |  |  |
Ziply Fiber | Bell CTS |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Goodwill expected to be deductible for tax purposes | 1,584 |  |  |  |  |
Ziply Fiber | Network infrastructure and equipment |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Property, plant and equipment | 2,973 |  |  |  |  |
Ziply Fiber | Land and buildings |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Property, plant and equipment | 537 |  |  |  |  |
Ziply Fiber | Assets under construction |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Property, plant and equipment | $ 435 |  |  |  |  |

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