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Financial Instruments and Financial Risk Management - Summary of Fair Value of Commodity Swaps Valuation by Discounted Cash Flow Method (Detail) lb in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2021 CAD ($) USD_per_Pound lb | Dec. 31, 2020 CAD ($) lb
Disclosure of fair value of commodity swaps [line items] |  |
Settlement payables (Note 29(b)) | $ | $ 9 | $ 6
Swap contract |  |
Disclosure of fair value of commodity swaps [line items] |  |
Settlement payables (Note 29(b)) | $ | $ 9 |
Swap contract | Zinc |  |
Disclosure of fair value of commodity swaps [line items] |  |
Pounds | lb | 140 |
Financial assets | $ | $ 9 |
Current derivative financial assets | $ | $ 9 |
Swap contract | Lead |  |
Disclosure of fair value of commodity swaps [line items] |  |
Pounds | lb | 59 |
Financial assets | $ | $ 0 |
Current derivative financial assets | $ | $ 0 |
Payable positions | Zinc |  |
Disclosure of fair value of commodity swaps [line items] |  |
Pounds | lb | 63 | 112
Payable positions | Lead |  |
Disclosure of fair value of commodity swaps [line items] |  |
Pounds | lb | 10 | 19
Payable positions | Swap contract | Zinc |  |
Disclosure of fair value of commodity swaps [line items] |  |
Average Price of Commitments | USD_per_Pound | 1.57 |
Payable positions | Swap contract | Lead |  |
Disclosure of fair value of commodity swaps [line items] |  |
Average Price of Commitments | USD_per_Pound | 1.05 |
Receivable positions | Zinc |  |
Disclosure of fair value of commodity swaps [line items] |  |
Pounds | lb | 175 | 142
Receivable positions | Lead |  |
Disclosure of fair value of commodity swaps [line items] |  |
Pounds | lb | 53 | 42
Receivable positions | Swap contract | Zinc |  |
Disclosure of fair value of commodity swaps [line items] |  |
Average Price of Commitments | USD_per_Pound | 1.60 |
Receivable positions | Swap contract | Lead |  |
Disclosure of fair value of commodity swaps [line items] |  |
Average Price of Commitments | USD_per_Pound | 1.04 |

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- Definition The amount of current derivative financial assets. [Refer: Derivative financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of current derivative financial liabilities. [Refer: Derivative financial liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Derivative, Swap Type, Average Fixed Price + References No definition available. + Details
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- Definition Disclosure of fair value of commodity swaps [line items]. + References No definition available. + Details
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- Details
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