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Financial instruments (Details) - CAD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 12, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Schedule of Investments [Line Items] |  |  |  |  |  |
Debt and finance lease liabilities, carrying value |  | $ 22,306 |  | $ 22,306 |  | $ 20,749
Debt and finance lease liabilities, fair value |  | 21,115 |  | 21,115 |  | 18,911
Payments for settlement of foreign currency forward contracts |  | 0 | $ 0 | 0 | $ 65 |
Foreign Exchange Contract |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Payments for settlement of foreign currency forward contracts | $ 65 |  |  |  |  |
Loss on derivative |  |  |  | 0 | 4 |
Foreign currency contracts, fair value |  | 0 |  | 0 |  | $ 0
Net Investment Hedge |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Unrealized gain (loss) on net investment hedge |  | $ (123) | $ 56 | $ 182 | $ (88) |

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