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Income Taxes - Additional Information (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure of Income Taxes [line items] |  |
Unrecognized deferred tax assets | $ 59 | $ 57
Decrease through sale of business deferred tax asset | 206 |
Unrecognized deferred tax liabilities | 905 | 836
Deferred income taxes | 14 | (616)
Current tax expense (income), related to Pillar Two income taxes | 3 |
Net Operating Loss |  |
Disclosure of Income Taxes [line items] |  |
Through Profit (Loss) | $ 1,200 | 713
Antamina |  |
Disclosure of Income Taxes [line items] |  |
Proportion of ownership interest in joint operation | 22.50% |
Chilean Mining Royalty Reform |  |
Disclosure of Income Taxes [line items] |  |
Deferred income taxes | $ 88 | 106
Canada | Net Operating Loss |  |
Disclosure of Income Taxes [line items] |  |
Unused tax losses | 147 | 282
Chile | Net Operating Loss |  |
Disclosure of Income Taxes [line items] |  |
Unused tax losses | $ 4,200 | $ 1,900

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- Definition The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The decrease in deferred tax liability (asset) resulting from the loss of control of a subsidiary. [Refer: Deferred tax liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of unused tax credits for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax credits [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_e&doctype=Standard -URIDate 2024-03-27 + Details
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