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Other long-term obligations - Summary of Other Long-Term Obligations (Detail) - CAD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Other Liabilities Disclosure [Abstract] |  |
Employee retirement benefits | $ 836 | $ 846
Asset retirement obligations and other environmental liabilities | 2,624 | 2,641
Share-based incentive compensation liabilities | 270 | 119
Operating lease liability | 132 | 144
Other obligations (note 11) | 315 | 120
Total other long-term obligations | $ 4,177 | $ 3,870

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