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Post-retirement benefits - Summary of movement in net defined benefit liability (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [Line Items] |  |  |
Beginning balance | $ (723) | $ (470) |
Amounts recognised in income statement | (147) | (33) |
Amounts recognised in other comprehensive income | 83 | (461) |
Employer contributions | 107 | 237 | $ 211
Assets transferred to defined contribution section | (7) | (6) |
Currency exchange rate gains | 29 | 10 |
Ending balance | (658) | (723) | $ (470)
Pension benefits |  |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |  |
Beginning balance | (95) |  |
Amounts recognised in income statement | (111) |  |
Amounts recognised in other comprehensive income | 58 |  |
Employer contributions | 71 |  |
Assets transferred to defined contribution section | (7) |  |
Currency exchange rate gains | 2 |  |
Ending balance | (82) | (95) |
Other benefits |  |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |  |
Beginning balance | (628) |  |
Amounts recognised in income statement | (36) |  |
Amounts recognised in other comprehensive income | 25 |  |
Employer contributions | 36 |  |
Assets transferred to defined contribution section | 0 |  |
Currency exchange rate gains | 27 |  |
Ending balance | $ (576) | $ (628) |

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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_f&doctype=Standard -URIDate 2024-03-27 + Details
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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 decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from expense (income) included in profit or loss. [Refer: Net defined benefit liability (asset); Profit (loss)] [Contrast: Post-employment benefit expense in profit or loss, defined benefit plans] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_140_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Assets Transferred to Defined Contribution + References No definition available. + Details
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- Details
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- Details
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