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Business acquisition and disposition - Schedule of Detailed Information About Business Combination (Details) $ in Millions, $ in Millions |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 30, 2025 CAD ($) | Jul. 30, 2025 USD ($) | Jun. 25, 2025 USD ($) | Jun. 30, 2026 CAD ($) | Jun. 30, 2025 CAD ($) | Jun. 30, 2026 CAD ($) | Jun. 30, 2025 CAD ($) | Dec. 31, 2025 CAD ($) | Aug. 01, 2025 CAD ($) | Aug. 01, 2025 USD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Gains (losses) on change in fair value of derivatives |  |  |  | $ (62) | $ (43) | $ (29) | $ (42) |  |  |
Ziply Fiber |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Cash consideration paid |  |  |  |  |  |  |  |  | $ 5,013 |
Deemed settlement of loan |  |  |  |  |  |  |  |  | 103 |
Total cost to be allocated |  |  |  |  |  |  |  |  | 5,116 |
Trade and other receivables |  |  |  |  |  |  |  |  | 96 |
Prepaid expenses |  |  |  |  |  |  |  |  | 44 |
Property, plant and equipment |  |  |  |  |  |  |  |  | 3,911 |
Finite-life intangible assets |  |  |  |  |  |  |  |  | 888 |
Indefinite-life intangible assets |  |  |  |  |  |  |  |  | 263 |
Post-employment benefit assets |  |  |  |  |  |  |  |  | 20 |
Trade payables and other liabilities |  |  |  |  |  |  |  |  | (225) |
Contract liabilities |  |  |  |  |  |  |  |  | (44) |
Debt due within one year |  |  |  |  |  |  |  |  | (3) |
Long-term debt |  |  |  |  |  |  |  |  | (2,754) |
Deferred tax liabilities |  |  |  |  |  |  |  |  | (194) |
Post-employment benefit obligations |  |  |  |  |  |  |  |  | (43) |
Other non-current liabilities |  |  |  |  |  |  |  |  | (4) |
Identifiable assets acquired (liabilities assumed), excluding cash and cash equivalents and goodwill |  |  |  |  |  |  |  |  | 1,955 |
Cash and cash equivalents |  |  |  |  |  |  |  |  | 166 |
Fair value of net assets acquired |  |  |  |  |  |  |  |  | 2,121 |
Goodwill |  |  |  |  |  |  |  |  | 2,995 |
Gains (losses) on change in fair value of derivatives |  |  |  |  |  |  |  | $ 7 |  |
Cash advances to related party, maximum amount |  |  | $ 150 |  |  |  |  |  |  |
Cash advances and loans from related parties | $ 103 | $ 75 |  |  |  |  |  |  |  |
Ziply Fiber | Bell CTS |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Goodwill expected to be deductible for tax purposes |  |  |  |  |  |  |  |  | 1,592 | $ 1,154
Ziply Fiber | Network infrastructure |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  | 2,939 |
Ziply Fiber | Land and buildings |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  | 537 |
Ziply Fiber | Construction in progress |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  | $ 435 |

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