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Accounting policies - Summary of IFRS 17 on Provisions (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure in tabular form of the estimated impact of international financial reporting standard seventeen on certain items in the income statement [line items] |  |
Provisions | $ (53) | $ (49)
Provisions | (43) | (41)
Net assets | (1,608) | $ (1,474)
IFRS 17 [member] | Estimated impact had the requirement of the accounting standard been followed [member] |  |
Disclosure in tabular form of the estimated impact of international financial reporting standard seventeen on certain items in the income statement [line items] |  |
Provisions | 9 |
Insurance liabilities | (9) |
Provisions | 23 |
Insurance liabilities | (23) |
Net assets | $ 0 |

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- Definition The amount of current provisions, including provisions for employee benefits. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 54 -Subparagraph l -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_54_l&doctype=Standard -URIDate 2022-03-24 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The amount of assets less the amount of liabilities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 1 -IssueDate 2022-03-24 -Paragraph IG63 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2022-en-r&anchor=para_IG63&doctype=Implementation%20Guidance -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_112_c&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of non-current provisions, including provisions for employee benefits. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 54 -Subparagraph l -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_54_l&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition Current insurance liabilities. + References No definition available. + Details
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- Definition Disclosure in tabular form of the estimated impact of international financial reporting standard seventeen on certain items in the balance sheet. + References No definition available. + Details
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- Definition Noncurrent insurance liabilities. + References No definition available. + Details
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- Details
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- Details
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