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Other long-term obligations - Table Narrative (Detail) - CAD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Other Liabilities Disclosure [Abstract] |  |
Employee retirement benefit obligations in current liabilities | $ 61 | $ 61
Asset retirement obligations and other environmental liabilities in current liabilities | 291 | 291
Lease liability due within one year, Operating leases | 102 | 100
Undiscounted commitments | $ 48 | $ 56

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