Financing and additional notes and loans payable information - Summary (Detail) - CAD ($) $ in Millions |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
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| Other Income and Expenses [Abstract] | |||||||||||||||||||||||||||||||||||||||||
| Debt-related interest | $ 131 | $ 192 | $ 203 | ||||||||||||||||||||||||||||||||||||||
| Capitalized interest | (105) | (155) | (141) | ||||||||||||||||||||||||||||||||||||||
| Net interest expense | 26 | 37 | 62 | ||||||||||||||||||||||||||||||||||||||
| Other interest | (14) | 4 | 7 | ||||||||||||||||||||||||||||||||||||||
| Total financing | [1] | $ 12 | $ 41 | $ 69 | |||||||||||||||||||||||||||||||||||||
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| X | ||||||||||
- Definition Amount of the cost of borrowed funds accounted for as interest expense. No definition available.
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- Definition Interest and debt related expenses associated with nonoperating financing activities of the entity. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of interest expense classified as operating and nonoperating. Includes, but is not limited to, cost of borrowing accounted for as interest expense. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of cash paid for interest capitalized, classified as investing activity. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- References No definition available.
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