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Employee benefit obligations - Surplus/(Deficit) in Plans by Region (Details) - GBP (£) £ in Millions	Dec. 31, 2024	Dec. 31, 2023
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)

X

- 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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X

- 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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- Details

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- Details

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