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Accounting for Financial Instruments - Summary of Derivatives Not Designated as Hedging Instruments and Embedded Derivatives (Detail) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items] |  |
Amount of gain (loss) recognized in other operating income (expense) | CAD 202 | CAD 185
Zinc [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Amount of gain (loss) recognized in other operating income (expense) | 11 | 45
Lead [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Amount of gain (loss) recognized in other operating income (expense) | 10 | (5)
Settlements Receivable And Payable [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Amount of gain (loss) recognized in other operating income (expense) | 190 | 153
Contingent Zinc Escalation Payment Embedded Derivative [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Amount of gain (loss) recognized in other operating income (expense) | (24) | (18)
Gold Stream Embedded Derivative [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Amount of gain (loss) recognized in other operating income (expense) | 13 | 6
Silver Stream Embedded Derivative [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Amount of gain (loss) recognized in other operating income (expense) | CAD 2 | CAD 4

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The gains (losses) on financial assets mandatorily measured at fair value through profit or loss in accordance with IFRS 9. [Refer: Financial assets at fair value through profit or loss, mandatorily measured at fair value; Gains (losses) on financial assets at fair value through profit or loss; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 20 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_20_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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- Details
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- Details
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- Details
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