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Provisions and Other Liabilities - Additional Information (Detail) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 CAD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($)
Disclosure of other provisions [line items] |  |  |
Provisions and other liabilities | $ 4,198 | $ 4,198 | $ 3,166
Provision for decommissioning, restoration and rehabilitation costs, period increase (decrease) | 975 |  |
Decrease in discount rate | 430 |  |
Increase in reclamation cash flows | 545 |  |
Other environment related provision |  |  |
Disclosure of other provisions [line items] |  |  |
Provisions |  | $ 36 | 43
Water quality management costs |  |  |
Disclosure of other provisions [line items] |  |  |
Extended period |  | 100 years |
Provisions and other liabilities | 990,000 | $ 990,000 | 628
Provision for decommissioning, restoration and rehabilitation costs |  |  |
Disclosure of other provisions [line items] |  |  |
Provisions and other liabilities | 3,907 | 3,907 | 2,820
Provision for decommissioning, restoration and rehabilitation costs, closed operations |  |  |
Disclosure of other provisions [line items] |  |  |
Provisions and other liabilities | 806 | 806 | 736
Steelmaking Coal | Water quality management costs |  |  |
Disclosure of other provisions [line items] |  |  |
Provisions and other liabilities | $ 515 | $ 515 | $ 277
Discount rate | Bottom of range | Provision for decommissioning, restoration and rehabilitation costs |  |  |
Disclosure of other provisions [line items] |  |  |
Nominal discount rate | 0.0561 | 0.0561 | 0.0613
Discount rate | Top of range | Provision for decommissioning, restoration and rehabilitation costs |  |  |
Disclosure of other provisions [line items] |  |  |
Nominal discount rate | 0.0713 | 0.0713 | 0.0807
Inflation rate | Provision for decommissioning, restoration and rehabilitation costs |  |  |
Disclosure of other provisions [line items] |  |  |
Nominal discount rate | 0.0200 | 0.0200 | 0.0200

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- Definition The amount recognised for new other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2023-01-01 -Paragraph 84 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_84_b&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 84 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_84_a&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 78 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_78_d&doctype=Standard -URIDate 2023-03-23 + Details
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