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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, 2021 | Dec. 31, 2020
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract] |  |
Intangible assets and goodwill | $ 1,093 | $ 1,101
Changes in foreign exchange rates | (2) | (8)
Intangible assets and goodwill | 1,091 | 1,093
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 | 391 | 399
Changes in foreign exchange rates | (2) | (8)
Intangible assets and goodwill | $ 389 | $ 391

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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 2021-01-01 -Paragraph 118 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_118_e_vii&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
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