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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
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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)

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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 -Paragraph B16 -Subparagraph c -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 -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 91 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_91_a&doctype=Standard -URIDate 2024-03-27 + Details
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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 -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph B16 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_B16_a&doctype=Appendix&subtype=B -URIDate 2024-03-27 + Details
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- Definition Disclosure Of Aggregate Investments In Associates Joint Ventures. + References No definition available. + Details
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- Definition Share of comprehensive income of associates and joint ventures accounted for using equity method. + References No definition available. + Details
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