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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2018 CAD ($)
Nueva Union [member] |
Disclosure of significant accounting policies [line items] |
Ownership interest in joint venture | 50.00%
Galore Creek Partnership [member] |
Disclosure of significant accounting policies [line items] |
Ownership interest in joint operation | 50.00%
Fort Hills Energy Limited Partnership [member] |
Disclosure of significant accounting policies [line items] |
Ownership interest in joint operation | 21.30%
Consideration for increased portion of ownership interest | $ 58
Antamina [member] |
Disclosure of significant accounting policies [line items] |
Ownership interest in joint operation | 22.50%
Bottom of range [member] | Fort Hills Energy Limited Partnership [member] |
Disclosure of significant accounting policies [line items] |
Ownership interest in joint operation | 20.89%
Top of range [member] | Fort Hills Energy Limited Partnership [member] |
Disclosure of significant accounting policies [line items] |
Ownership interest in joint operation | 21.30%

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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 2018-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_21_a_iv&doctype=Standard -URIDate 2018-03-16 + Details
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- Details
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