Business segments - Table Narrative (Detail) - CAD ($) $ in Millions |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
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| Segment Reporting Information [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Revenue from contracts with customers | $ 38,678 | $ 40,901 | $ 44,465 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Revenue outside the scope of ASC 606 | 8,240 | 10,458 | 6,237 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Revenues | [1] | 46,918 | 51,359 | 50,702 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Plant and equipment under construction | 3,467 | 3,632 | 3,251 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Assets | 42,309 | 42,938 | 41,199 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Corporate and other | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Segment Reporting Information [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Revenues | 0 | 0 | 0 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Assets | 3,658 | 2,962 | 2,366 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Corporate and other | Calgary Imperial Campus | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Segment Reporting Information [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Assets | 466 | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| United States Exports | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Segment Reporting Information [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Revenues | $ 9,223 | $ 10,300 | $ 8,982 | ||||||||||||||||||||||||||||||||||||||||||||||||||
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- Definition Total revenue from sales of goods and services during the reporting period, reduced by sales returns and allowances and sales discounts. Also includes federal excise tax which is then deducted as an expense. No definition available.
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- Definition Amount of asset recognized for present right to economic benefit. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of revenue that is not accounted for under Topic 606. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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