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Post-retirement benefits - Summary of funding policy and contributions to plans (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] |  |  |
Contributions to defined benefit plans | $ 107 | $ 237 | $ 211
Contributions to defined contribution plans | 451 | 410 | 363
Total | 558 | $ 647 | $ 574
Pension benefits |  |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |  |
Contributions to defined benefit plans | 71 |  |
Contributions to defined contribution plans | 448 |  |
Total | 519 |  |
Other benefits |  |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |  |
Contributions to defined benefit plans | 36 |  |
Contributions to defined contribution plans | 3 |  |
Total | $ 39 |  |

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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 The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan. [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 Contributions to Defined Contribution Plans + References No definition available. + Details
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- Details
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- Details
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