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Contingencies and commitments - Summary of subsidiaries and joint operations contingent liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure Of Contingent Liabilities [Abstract] |  |
Indemnities and other performance guarantees | $ 552 | $ 473

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- Definition The amount of the estimated financial effect of contingent liabilities. [Refer: Contingent liabilities [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2016-01-13 -Paragraph 86 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2016-03-30&anchor=para_86_a&doctype=Standard -URIDate 2016-03-31 + Details
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