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Commitments and contingencies - Narrative (Details) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2025 | Dec. 31, 2024
Disclosure of contingent liabilities [line items] |  |  |
Operating revenues |  | $ 24,468 | $ 24,409
Legal proceedings contingent liability |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Operating revenues | $ 44 |  |

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