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Commitments and contingencies - Narrative (Details) $ in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 CAD ($) | Dec. 31, 2024 CAD ($) carrier | Dec. 31, 2023 CAD ($) | Dec. 31, 2025 CAD ($) | Dec. 31, 2025 USD ($)
Disclosure of contingent liabilities [line items] |  |  |  |  |
Number of major cable carriers | carrier |  | 5 |  |  |
Operating revenues |  | $ 24,409 | $ 24,673 |  |
Legal proceedings contingent liability |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |
Operating revenues | $ 44 |  |  |  |
Forecast |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |
Consideration transferred, liabilities assumed, debt |  |  |  | $ 2,000 | $ 1,450
Consideration transferred, acquisition-date fair value |  |  |  | 7,000 | 5,100
Forecast | Zipfy Fiber |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |
Consideration recognized as of acquisition date |  |  |  | $ 5,000 | $ 3,650

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