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Post-retirement benefits - Summary of amount recognised in balance sheet (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of information about amounts recognized in balance sheet [Line Items] |  |  |
Net deficit to be shown in the balance sheet | $ (658) | $ (723) | $ (470)
Effect of asset ceiling | (50) | (66) |
– Deficits | (1,063) | (1,189) |
– Surpluses | 405 | 466 |
Net deficits on pension plans | (82) | (95) |
Pension benefits |  |  |
Disclosure of information about amounts recognized in balance sheet [Line Items] |  |  |
Net deficit to be shown in the balance sheet | (82) | (95) |
Effect of asset ceiling | (50) |  |
– Deficits | (487) |  |
– Surpluses | 405 |  |
Net deficits on pension plans | (82) |  |
Other benefits |  |  |
Disclosure of information about amounts recognized in balance sheet [Line Items] |  |  |
Net deficit to be shown in the balance sheet | (576) | (628) |
Effect of asset ceiling | 0 |  |
– Deficits | (576) |  |
– Surpluses | 0 |  |
Net deficits on pension plans | 0 |  |
Unfunded |  |  |
Disclosure of information about amounts recognized in balance sheet [Line Items] |  |  |
Unfunded post-retirement healthcare obligation | (576) | (628) |
Unfunded | Pension benefits |  |  |
Disclosure of information about amounts recognized in balance sheet [Line Items] |  |  |
Unfunded post-retirement healthcare obligation | 0 |  |
Unfunded | Other benefits |  |  |
Disclosure of information about amounts recognized in balance sheet [Line Items] |  |  |
Unfunded post-retirement healthcare obligation | (576) |  |
Plan assets |  |  |
Disclosure of information about amounts recognized in balance sheet [Line Items] |  |  |
Net deficit to be shown in the balance sheet | 10,155 | 11,138 | 10,708
Plan assets | Pension benefits |  |  |
Disclosure of information about amounts recognized in balance sheet [Line Items] |  |  |
Net deficit to be shown in the balance sheet | 10,155 | 11,138 |
Plan assets | Other benefits |  |  |
Disclosure of information about amounts recognized in balance sheet [Line Items] |  |  |
Net deficit to be shown in the balance sheet | 0 | 0 |
Present value of defined benefit obligation |  |  |
Disclosure of information about amounts recognized in balance sheet [Line Items] |  |  |
Net deficit to be shown in the balance sheet | (10,763) | (11,795) | $ (11,177)
Present value of defined benefit obligation | Pension benefits |  |  |
Disclosure of information about amounts recognized in balance sheet [Line Items] |  |  |
Net deficit to be shown in the balance sheet | (10,187) | (11,167) |
Present value of defined benefit obligation | Other benefits |  |  |
Disclosure of information about amounts recognized in balance sheet [Line Items] |  |  |
Net deficit to be shown in the balance sheet | (576) | (628) |
Present value of defined benefit obligation | Funded |  |  |
Disclosure of information about amounts recognized in balance sheet [Line Items] |  |  |
Net deficit to be shown in the balance sheet | (9,840) | (10,799) |
Present value of defined benefit obligation | Funded | Pension benefits |  |  |
Disclosure of information about amounts recognized in balance sheet [Line Items] |  |  |
Net deficit to be shown in the balance sheet | (9,840) |  |
Present value of defined benefit obligation | Funded | Other benefits |  |  |
Disclosure of information about amounts recognized in balance sheet [Line Items] |  |  |
Net deficit to be shown in the balance sheet | 0 |  |
Present value of defined benefit obligation | Unfunded |  |  |
Disclosure of information about amounts recognized in balance sheet [Line Items] |  |  |
Net deficit to be shown in the balance sheet | (923) | $ (996) |
Present value of defined benefit obligation | Unfunded | Pension benefits |  |  |
Disclosure of information about amounts recognized in balance sheet [Line Items] |  |  |
Net deficit to be shown in the balance sheet | (347) |  |
Present value of defined benefit obligation | Unfunded | Other benefits |  |  |
Disclosure of information about amounts recognized in balance sheet [Line Items] |  |  |
Net deficit to be shown in the balance sheet | $ (576) |  |

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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&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 The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Deficit in plan. + References No definition available. + Details
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- Definition Disclosure of information about amounts recognized in balance sheet [Line Items] + References No definition available. + Details
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- Definition Effect of asset ceiling. + References No definition available. + Details
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- Definition The combined total of non-current and current pension surpluses classified as trade and other receivables. + References No definition available. + Details
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- Details
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