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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020
NuevaUnión |
Disclosure of joint ventures [line items] |
Ownership interest in joint venture | 50.00%
Galore Creek Partnership |
Disclosure of joint ventures [line items] |
Ownership interest in joint operation | 50.00%
Fort Hills Energy Limited Partnership |
Disclosure of joint ventures [line items] |
Ownership interest in joint operation | 21.30%
Antamina |
Disclosure of joint ventures [line items] |
Ownership interest in joint operation | 22.50%

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- Definition The proportion of ownership interest in a joint operation attributable to the entity. [Refer: Joint operations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_21_a_iv&doctype=Standard -URIDate 2020-01-01 + Details
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