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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, 2019 | Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | $ (32) | $ (153)
Swap contract | Zinc |  |
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | (4) | (40)
Swap contract | Lead |  |
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | (2) | (4)
Settlement receivables and payables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | (49) | (117)
Embedded Derivatives | Zinc |  |
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | 1 | 13
Embedded Derivatives | Gold |  |
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | 15 | (1)
Embedded Derivatives | Silver |  |
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | $ 7 | $ (4)

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- Definition The gains (losses) on financial assets at fair value through profit or loss. [Refer: Financial assets at fair value through profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 20 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_20_a_i&doctype=Standard -URIDate 2019-03-27 + Details
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