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Goodwill - Schedule of Reconciliation of Changes in Goodwill (Detail) - Goodwill - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |
Intangible assets and goodwill | $ 1,091 | $ 1,093
Changes in foreign exchange rates | 27 | (2)
Intangible assets and goodwill | 1,118 | 1,091
Steelmaking Coal Operations |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |
Intangible assets and goodwill | 702 | 702
Changes in foreign exchange rates | 0 | 0
Intangible assets and goodwill | 702 | 702
Quebrada Blanca |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |
Intangible assets and goodwill | 389 | 391
Changes in foreign exchange rates | 27 | (2)
Intangible assets and goodwill | $ 416 | $ 389

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- Definition The increase (decrease) in intangible assets and goodwill resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2022-03-24 -Paragraph 118 -Subparagraph e -Clause vii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2022-en-r&anchor=para_118_e_vii&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of intangible assets and goodwill held by the entity. [Refer: Goodwill; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
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