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Provisions - Summary of Movements in Provisions (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Reconciliation of changes in other provisions [abstract] |  |
Provisions, beginning balance | $ 4,198 |
Settled during the year | (150) |
Change in discount rate | (397) |
Change in amount and timing of cash flows | 414 |
Accretion | 182 |
Change from the NSC/POSCO transaction | 127 |
Sale of steelmaking coal business | (1,856) |
Other | (4) |
Changes in foreign exchange rates | 112 |
Provisions, ending balance | 2,626 |
Less current portion of provisions | (187) | $ (347)
Non-current provisions | 2,439 |
Decommissioning and Restoration Provisions |  |
Reconciliation of changes in other provisions [abstract] |  |
Provisions, beginning balance | 3,907 |
Settled during the year | (123) |
Change in discount rate | (397) |
Change in amount and timing of cash flows | 374 |
Accretion | 177 |
Change from the NSC/POSCO transaction | 127 |
Sale of steelmaking coal business | (1,828) |
Other | (4) |
Changes in foreign exchange rates | 95 |
Provisions, ending balance | 2,328 |
Less current portion of provisions | (149) |
Non-current provisions | 2,179 |
Other Provisions |  |
Reconciliation of changes in other provisions [abstract] |  |
Provisions, beginning balance | 291 |
Settled during the year | (27) |
Change in discount rate | 0 |
Change in amount and timing of cash flows | 40 |
Accretion | 5 |
Change from the NSC/POSCO transaction | 0 |
Sale of steelmaking coal business | (28) |
Other | 0 |
Changes in foreign exchange rates | 17 |
Provisions, ending balance | 298 |
Less current portion of provisions | (38) |
Non-current provisions | $ 260 |

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- Definition The increase (decrease) in other provisions resulting from a change in discount rate. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2024-01-01 -Paragraph 84 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2024-en-r&anchor=para_84_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in other provisions resulting from foreign currency exchange rate changes on provisions measured in a currency different from the entity's presentation currency. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2024-01-01 -Paragraph 84 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2024-en-r&anchor=para_84&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase in other provisions through adjustments arising from the passage of time. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2024-01-01 -Paragraph 84 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2024-en-r&anchor=para_84_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in other provisions resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2024-01-01 -Paragraph 84 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2024-en-r&anchor=para_84&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of non-current provisions other than provisions for employee benefits. [Refer: Non-current provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 78 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78_d&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of provisions other than provisions for employee benefits. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2024-01-01 -Paragraph 84 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2024-en-r&anchor=para_84_a&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 78 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78_d&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount used (ie incurred and charged against the provision) for other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2024-01-01 -Paragraph 84 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2024-en-r&anchor=para_84_c&doctype=Standard -URIDate 2024-03-27 + Details
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