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Accounting for Financial Instruments - Summary of Provisionally Valued Outstanding Receivable And Payable Positions (Detail) lb in Millions | 12 Months Ended
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Dec. 31, 2017 USD_per_Pound lb | Dec. 31, 2016 USD_per_Pound lb
Copper [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Outstanding receivable | 138 | 114
Commodity price | USD_per_Pound | 3.26 | 2.50
Zinc [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Outstanding receivable | 197 | 231
Outstanding payable | 97 | 114
Commodity price | USD_per_Pound | 1.50 | 1.17
Lead [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Outstanding receivable | 44 | 26
Outstanding payable | 30 | 20
Commodity price | USD_per_Pound | 1.13 | 0.90

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Commodity price. + References No definition available. + Details
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- Definition Payable position provisionally valued in pounds. + References No definition available. + Details
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- Definition Receivable position provisionally valued in pounds. + References No definition available. + Details
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- Details
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- Details
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Period Type: |

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- Details
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