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Related party disclosures - Summary of Related Party Disclosures for Associates and Joint Ventures (Detail) - Associates [member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of transactions between related parties [Line Items] |  |  |
Fee revenue from associates | $ 3 | $ 1 | $ 10
Amounts owed by associates | 11 | 11 | 3
Amounts owed to associates | $ 0 | $ (4) | $ (4)

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- Definition The amounts payable resulting from related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2021-01-01 -Paragraph 20 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_20&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2021-01-01 -Paragraph 18 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_18_b&doctype=Standard -URIDate 2021-03-24 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with 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 2021-01-01 -Paragraph 21 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_21_c&doctype=Standard -URIDate 2021-03-24 + Details
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Balance Type: | credit
Period Type: | duration

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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 2021-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_78_b&doctype=Standard -URIDate 2021-03-24 + Details
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Balance Type: | debit
Period Type: | instant

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- Details
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Data Type: | na
Balance Type: |
Period Type: |