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Provisions and Other Liabilities - Additional Information (Detail) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 CAD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2021 CAD ($)
Disclosure of other provisions [line items] |  |  |
Provisions and other liabilities | $ 3,166 | $ 3,166 | $ 4,023
Provision for decommissioning, restoration and rehabilitation costs, period increase (decrease) | 690 |  |
Decrease in discount rate | 121 |  |
Increase in reclamation cash flows | 569 |  |
Other environment related provision |  |  |
Disclosure of other provisions [line items] |  |  |
Provisions |  | $ 43 | 73
Water quality management costs |  |  |
Disclosure of other provisions [line items] |  |  |
Extended period |  | 100 years |
Provisions and other liabilities | 628,000 | $ 628,000 | 1,300
Provision for decommissioning, restoration and rehabilitation costs |  |  |
Disclosure of other provisions [line items] |  |  |
Provisions and other liabilities | 2,820 | 2,820 | 3,725
Provision for decommissioning, restoration and rehabilitation costs, closed operations |  |  |
Disclosure of other provisions [line items] |  |  |
Provisions and other liabilities | 736 | 736 | 721
Steelmaking Coal | Water quality management costs |  |  |
Disclosure of other provisions [line items] |  |  |
Provisions and other liabilities | $ 277 | $ 277 | $ 769
Discount rate | Bottom of range | Provision for decommissioning, restoration and rehabilitation costs |  |  |
Disclosure of other provisions [line items] |  |  |
Nominal discount rate | 0.0613 | 0.0613 | 0.0386
Discount rate | Top of range | Provision for decommissioning, restoration and rehabilitation costs |  |  |
Disclosure of other provisions [line items] |  |  |
Nominal discount rate | 0.0807 | 0.0807 | 0.0535
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 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 2022-03-24 -Paragraph 84 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&anchor=para_84_a&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 78 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_78_d&doctype=Standard -URIDate 2022-03-24 + Details
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