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Contingencies and commitments - Summary of subsidiaries and joint operations contingent liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Contingent Liabilities [Abstract]
Indemnities and other performance guarantees	$ 317	$ 552

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- References

No definition available.

+ Details

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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 2017-01-01
-Paragraph 86
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_86_a&doctype=Standard
-URIDate 2017-03-09

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