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Related party disclosures - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of transactions between related parties [Line Items] |  |
Financial guarantee on bank loan | $ 12 | $ 12
Outstanding commitments made by entity, related party transactions | 10 | 10
Barclay associate [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Loan to and from material associate investment (offset in accordance with IAS32) | $ 237 | $ 237
Average interest rate on interest payable and receivable relating to loan to and from material associate investment | 0.90% | 0.80%
Barclay associate [member] | Dispute Settlement [Member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Payment towards settlement of dispute | $ 18 |

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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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Balance Type: | na
Period Type: | duration

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- Definition The amount of outstanding commitments made by the entity in 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 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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Balance Type: | credit
Period Type: | instant

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- Definition The amount of liabilities settled by the entity on behalf of a related party in related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2021-01-01 -Paragraph 21 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_21_j&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Financial guarantee on bank loan. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Interest payable (receivable) equivalent average rate. + References No definition available. + Details
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Period Type: | duration

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- Definition Loans both payable and receivable offset net. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |