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Financial Instruments and Financial Risk Management - Summary of Provisionally Valued Outstanding Receivable And Payable Positions (Detail) lb in Millions | 12 Months Ended
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Dec. 31, 2020 USD_per_Pound lb | Dec. 31, 2019 USD_per_Pound lb
Receivable positions | Copper |  |
Disclosure of fair value of settlement receivables and payables [line items] |  |
Pounds | lb | 132 | 65
US$/lb. | USD_per_Pound | 3.52 | 2.80
Receivable positions | Zinc |  |
Disclosure of fair value of settlement receivables and payables [line items] |  |
Pounds | lb | 142 | 239
US$/lb. | USD_per_Pound | 1.24 | 1.04
Receivable positions | Lead |  |
Disclosure of fair value of settlement receivables and payables [line items] |  |
Pounds | lb | 42 | 74
US$/lb. | USD_per_Pound | 0.90 | 0.87
Payable positions | Zinc |  |
Disclosure of fair value of settlement receivables and payables [line items] |  |
Pounds | lb | 112 | 79
US$/lb. | USD_per_Pound | 1.24 | 1.04
Payable positions | Lead |  |
Disclosure of fair value of settlement receivables and payables [line items] |  |
Pounds | lb | 19 | 10
US$/lb. | USD_per_Pound | 0.90 | 0.87

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- Definition Derivative, Nonmonetary Notional Amount, Mass + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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