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Interests in associates, joint ventures and other investments - Summary of Aggregate Financial Performance of Associates and Joint Ventures (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of principal associates and joint ventures [line items]
Earnings/(losses) from associates (note 4)	£ 34	£ 25	£ (60)
Share of other comprehensive (loss)/income of associates	0	(1)	51
Associates and Joint Ventures
Disclosure of principal associates and joint ventures [line items]
Earnings/(losses) from associates (note 4)	36	70	(60)
Share of other comprehensive (loss)/income of associates	0	(1)	51
Share of total comprehensive earnings/(loss) of associates	£ 36	£ 69	£ (9)

X

- 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
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-IssueDate 2024-01-01
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-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The entity's share of the profit (loss) from continuing operations of associates and joint ventures accounted for using the equity method. [Refer: Total for all associates [member]; Continuing operations, unless line item indicates otherwise [member]; Investments accounted for using equity method; Total for all joint ventures [member]; Profit (loss) from continuing operations]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2024-01-01
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- Definition

Disclosure Of Aggregate Investments In Associates Joint Ventures.

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- Definition

Share of comprehensive income of associates and joint ventures accounted for using equity method.

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