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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, 2020 | Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | $ 109 | $ (32)
Swap contract | Zinc |  |
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | 12 | (4)
Swap contract | Lead |  |
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | (5) | (2)
Settlement receivables and payables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | 47 | (49)
Embedded Derivatives | Zinc |  |
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | (1) | 1
Embedded Derivatives | Gold |  |
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | 28 | 15
Embedded Derivatives | Silver |  |
Disclosure of detailed information about financial instruments [line items] |  |
Settlement pricing adjustments | $ 28 | $ 7

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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 2020-01-01 -Paragraph 20 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_20_a_i&doctype=Standard -URIDate 2020-01-01 + Details
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