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Employee benefit obligations - Employee obligations and assets (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of net defined benefit liability (asset) [line items] |  |
Obligations | $ (305) | $ (324)
Assets | 201 | 219
Net (obligations)/assets | (104) | (105)
Germany |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Obligations | (98) | (103)
Net (obligations)/assets | (98) | (103)
U.K |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Obligations | (133) | (145)
Assets | 143 | 167
Net (obligations)/assets | 10 | 22
U.S. and other* |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Obligations | (74) | (76)
Assets | 58 | 52
Net (obligations)/assets | (16) | (24)
Other |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net (obligations)/assets | $ (7) | $ (6)

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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 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 amount of 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/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of deficit in a defined benefit plan. [Refer: Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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