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Intangible assets - Additional information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Exploration and evaluation costs | $ 445 | $ 497 | $ 576
Exploration and evaluation assets [Member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Capitalised related to projects which had not yet been approved to proceed | 420 | 726 |
Exploration and evaluation costs | 393 | 711 |
Early works expenditure within property, plant and equipment | $ 27 | $ 15 |

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- Definition The amount of expenditure capitalised during the construction of non-current assets that are not yet available for use. [Refer: Non-current assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2016-01-13 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_37&doctype=Standard -URIDate 2016-03-31 + Details
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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 amount of expense arising from the search for mineral resources, including minerals, oil, natural gas and similar non-regenerative resources after the entity has obtained legal rights to explore in a specific area, as well as the determination of the technical feasibility and commercial viability of extracting the mineral resource. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 6 -IssueDate 2016-01-13 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=6&date=2016-03-30&anchor=para_24_b&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount of expenditures recognised in the carrying amount of an item of property, plant and equipment in the course of its construction. [Refer: Carrying amount [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2016-01-13 -Paragraph 74 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_74_b&doctype=Standard -URIDate 2016-03-31 + Details
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- Details
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