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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, 2019 CAD ($) USD_per_Pound lb | Dec. 31, 2018 CAD ($) lb
Disclosure of fair value of commodity swaps [line items] |  |
Financial liabilities | $ | $ (2) | $ (6)
Swap contract |  |
Disclosure of fair value of commodity swaps [line items] |  |
Financial liabilities | $ | $ (3) |
Swap contract | Zinc |  |
Disclosure of fair value of commodity swaps [line items] |  |
Pounds | 77 |
Financial liabilities | $ | $ (2) |
Swap contract | Lead |  |
Disclosure of fair value of commodity swaps [line items] |  |
Pounds | 50 |
Financial assets | $ | $ (1) |
Payable positions | Zinc |  |
Disclosure of fair value of commodity swaps [line items] |  |
Pounds | 79 | 77
Payable positions | Lead |  |
Disclosure of fair value of commodity swaps [line items] |  |
Pounds | 10 | 16
Payable positions | Swap contract | Zinc |  |
Disclosure of fair value of commodity swaps [line items] |  |
Average Price of Commitments | USD_per_Pound | 1.02 |
Payable positions | Swap contract | Lead |  |
Disclosure of fair value of commodity swaps [line items] |  |
Average Price of Commitments | USD_per_Pound | 0.88 |
Receivable positions | Zinc |  |
Disclosure of fair value of commodity swaps [line items] |  |
Pounds | 239 | 208
Receivable positions | Lead |  |
Disclosure of fair value of commodity swaps [line items] |  |
Pounds | 74 | 24
Receivable positions | Swap contract | Zinc |  |
Disclosure of fair value of commodity swaps [line items] |  |
Average Price of Commitments | USD_per_Pound | 1.04 |
Receivable positions | Swap contract | Lead |  |
Disclosure of fair value of commodity swaps [line items] |  |
Average Price of Commitments | USD_per_Pound | 0.89 |

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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 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Derivative, Swap Type, Average Fixed Price + References No definition available. + Details
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- Details
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