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Financial Instruments and Financial Risk Management - Summary of Derivatives Not Designated as Hedging Instruments and Embedded Derivatives (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items] |  |
Amount of gain (loss) recognized in other operating income (expense) | $ (153) | $ 202
Zinc [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Amount of gain (loss) recognized in other operating income (expense) | (40) | 11
Lead [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Amount of gain (loss) recognized in other operating income (expense) | (4) | 10
Settlements Receivable And Payable [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Amount of gain (loss) recognized in other operating income (expense) | (117) | 190
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) | 13 | (24)
Gold Stream Embedded Derivative [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Amount of gain (loss) recognized in other operating income (expense) | (1) | 13
Silver Stream Embedded Derivative [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Amount of gain (loss) recognized in other operating income (expense) | $ (4) | $ 2

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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 Gains (losses) on derivative assets liabilities at fair value through profit or loss, mandatorily measured at fair value. + References No definition available. + Details
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