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Income Taxes - Additional Information (Detail) $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 CAD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($)
Disclosure of Income Taxes [line items] |  |  |
Unrecognized deferred tax assets | $ 296 |  | $ 293
Unrecognized deferred tax liabilities | 731 |  | 759
Unused tax losses | 3,810 |  | 2,560
Deferred tax recovery |  | $ 39 |
Chile |  |  |
Disclosure of Income Taxes [line items] |  |  |
Unused tax losses | $ 847 |  | $ 426
Antamina |  |  |
Disclosure of Income Taxes [line items] |  |  |
Proportion of ownership interest in joint operation | 22.50% |  |

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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 2020-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_e&doctype=Standard -URIDate 2020-01-01 + Details
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