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Employee benefit obligations - Defined benefit pension schemes (Details) - 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] |  |  |
Service and administration costs | $ (11) | $ (10) | $ (13)
Finance expense | (5) | (5) | (3)
Total defined benefit pension costs including exceptional past service charges. | (16) | (19) | (16)
Cost of sales |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | (8) | (8) | (11)
Exceptional past service charge |  | (4) |
SGA |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | $ (3) | $ (2) | $ (2)

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- Definition The amount of defined benefit pension costs including exceptional past service charge. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition Exceptional Past Service Charge. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Total service and administration costs. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition The expense of employee service in the current period arising from defined benefit plans. [Refer: Post-employment benefit expense in profit or loss, defined benefit plans] [Contrast: Increase in net defined benefit liability (asset) resulting from current service cost] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_135_b&doctype=Standard -URIDate 2024-03-27 + Details
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Period Type: | duration

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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 interest expense arising from defined benefit plans. [Refer: Interest expense; Post-employment benefit expense in profit or loss, defined benefit plans] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_135_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Details
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- Details
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Period Type: |