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Employee benefit obligations - Surplus/(Deficit) in Plans by Region (Details) - GBP (£) £ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of defined benefit plans [line items] |  |
Surplus (deficit) in plan | £ (114) | £ (122)
United Kingdom |  |
Disclosure of defined benefit plans [line items] |  |
Surplus (deficit) in plan | 1 | 1
North America |  |
Disclosure of defined benefit plans [line items] |  |
Surplus (deficit) in plan | (23) | (30)
Western Continental Europe |  |
Disclosure of defined benefit plans [line items] |  |
Surplus (deficit) in plan | (56) | (60)
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe |  |
Disclosure of defined benefit plans [line items] |  |
Surplus (deficit) in plan | £ (36) | £ (33)

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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 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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- Details
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