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Related party disclosures - Summary of Related Party Disclosures for Associates and Joint Ventures (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of transactions between related parties [Line Items] |  |  |
Revenue from associates and joint ventures | $ 9 | $ 6 | $ 3
Loans to associates |  | 9 | 7
Other amounts owed by associates and joint ventures | 2 | 1 | 2
Associates [member] |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Revenue from associates and joint ventures | 8 | 5 | 3
Loans to associates |  | 9 | 7
Other amounts owed by associates and joint ventures | 2 | 1 | $ 2
Joint ventures [member] |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Revenue from associates and joint ventures | $ 1 | $ 1 |

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- Definition The amounts receivable resulting from related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2017-01-01 -Paragraph 20 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_20&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2017-01-01 -Paragraph 18 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_18_b&doctype=Standard -URIDate 2017-03-09 + 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 revenue arising from the rendering of services in related party transactions. [Refer: Revenue; Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2017-01-01 -Paragraph 21 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_21_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of receivables due from related parties. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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- Details
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