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Contingencies - Environmental Liabilities (Details) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |
Environmental remediation expense | $ 3 | $ 2 | $ 7 | $ 6 |
Accrued environmental loss contingencies, noncurrent | $ 250 |  | $ 250 |  | $ 257
Term for expected payments to be made |  |  | 10 years |  |

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