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Contingencies and commitments - Summary of subsidiaries and joint operations contingent liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of contingent liabilities [abstract] |  |
Indemnities and other performance guarantees | $ 204 | $ 317

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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 2019-01-01 -Paragraph 86 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2019-en-r&anchor=para_86_a&doctype=Standard -URIDate 2019-03-27 + Details
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