XML 103 R68.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Summary of Significant Accounting Policies - Summary of Expected Useful Lives (Detail) | 12 Months Ended
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Dec. 31, 2017
Bottom of range [member] | Buildings and equipment (not used in production) [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Expected useful lives | 2 years
Bottom of range [member] | Plant and equipment (smelting operations) [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Expected useful lives | 3 years
Top of range [member] | Buildings and equipment (not used in production) [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Expected useful lives | 50 years
Top of range [member] | Plant and equipment (smelting operations) [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Expected useful lives | 30 years

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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 The useful lives or depreciation rates used for property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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- Details
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