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Interests in associates, joint ventures and other investments - Summary of Movements in Associates, Joint Ventures and Other Investments (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Movements in interests in associates and joint ventures
Beginning balance	£ 287	£ 305
Additions	0	39
Share of profits of associates	34	25
Share of other comprehensive income of associates	0	(1)	£ 51
Dividends	(29)	(30)
Other movements	3	(12)
Exchange adjustments	(9)	(19)
Disposals	(10)	(5)
Impairment charges	(23)	(15)
Ending balance	253	287	305
Movements in interests in other investments
Beginning balance	333	370
Additions	24	2
Other movements	62
Exchange adjustments	0
Disposals	0	(10)
Revaluation of other investments through profit or loss	(14)	(26)
Revaluation of other investments through other comprehensive income	(7)	(3)
Ending balance	£ 398	£ 333	£ 370

X

- Definition

The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2024-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

The amount of investments other than investments accounted for using the equity method. [Refer: Investments accounted for using equity method]

+ 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
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- Definition

The entity's share of the other comprehensive income of associates and joint ventures accounted for using the equity method, net of tax. [Refer: Total for all associates [member]; Investments accounted for using equity method; Total for all joint ventures [member]; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2024-01-01
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_B16_c&doctype=Appendix&subtype=B
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_91_a&doctype=Standard
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Additions for associates and joint ventures.

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Additions for other investments.

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Disposals Associates And Joint Ventures

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Disposals other investments.

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Dividends from associates and joint ventures.

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Increase (Decrease) Through Other Changes Associates And Joint Ventures

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Investments In Associates And Joint Ventures [abstract]

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Other investments 1 [abstract]

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Revaluation of other investments through other comprehensive income.

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Write-downs (Reversals Of Write-downs) of Associates and Joint Ventures

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