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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, 2019 USD_per_Pound lb | Dec. 31, 2018 USD_per_Pound lb
Receivable positions | Copper |  |
Disclosure of fair value of settlement receivables and payables [line items] |  |
Pounds | lb | 65 | 93
US$/lb. | USD_per_Pound | 2.80 | 2.70
Receivable positions | Zinc |  |
Disclosure of fair value of settlement receivables and payables [line items] |  |
Pounds | lb | 239 | 208
US$/lb. | USD_per_Pound | 1.04 | 1.12
Receivable positions | Lead |  |
Disclosure of fair value of settlement receivables and payables [line items] |  |
Pounds | lb | 74 | 24
US$/lb. | USD_per_Pound | 0.87 | 0.91
Payable positions | Zinc |  |
Disclosure of fair value of settlement receivables and payables [line items] |  |
Pounds | lb | 79 | 77
US$/lb. | USD_per_Pound | 1.04 | 1.12
Payable positions | Lead |  |
Disclosure of fair value of settlement receivables and payables [line items] |  |
Pounds | lb | 10 | 16
US$/lb. | USD_per_Pound | 0.87 | 0.91

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- Definition Derivative, Nonmonetary Notional Amount, Mass + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Derivative, Underlying Commodity Price + References No definition available. + Details
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- Definition Disclosure of fair value of settlement receivables and payables [line items]. + References No definition available. + Details
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- Details
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- Details
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- Details
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Balance Type: |
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- Details
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Balance Type: |
Period Type: |

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- Details
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