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Contributed equity - Summary of Information about Shares Reserved for Employee Share Plans (Detail) - Employee Share Plans [Member] - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Disclosure of classes of share capital [line items] |  |
Beginning balance, shares | 2,140,927 | 1,873,777
Beginning balance | $ (49) | $ (38)
Purchases during the period, shares | 1,262,082 | 2,332,121
Purchases during the period | $ (25) | $ (57)
Vested/allocated during the period, shares | (424,959) | (2,064,971)
Vested/allocated during the period | $ 9 | $ 46
Ending balance, shares | 2,978,050 | 2,140,927
Ending balance | $ (65) | $ (49)

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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 number of shares reserved for issue under options and contracts for the sale of shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 79 -Subparagraph a -Clause vii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_79_a_vii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition Number of shares outstanding value reserved for employee share plan. + References No definition available. + Details
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- Definition Shares reserved for employee share plan purchases. + References No definition available. + Details
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Balance Type: | na
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- Definition Shares reserved for employee share plan purchases value. + References No definition available. + Details
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Balance Type: | credit
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- Definition Shares reserved for employee share plan vested and issued. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Shares reserved for employee share plan vested and issued value. + References No definition available. + Details
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- Details
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Period Type: |