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Interests in associates, joint ventures and other investments - Additional Information (Details) - GBP (£) £ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Kantar US |  |  |
Disclosure of principal associates and joint ventures [line items] |  |  |
Cumulative share of unrecognised losses | £ 57 | £ 30 | £ 30
ROW Chain |  |  |
Disclosure of principal associates and joint ventures [line items] |  |  |
Cumulative share of unrecognised losses | £ 196 | £ 138 | £ 34

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- Definition The cumulative amount of the unrecognised share of losses of associates if the entity has stopped recognising its share of losses when applying the equity method. [Refer: Total for all associates [member]; Unrecognised share of losses of associates] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph 22 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_22_c&doctype=Standard -URIDate 2024-03-27 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Disclosure of principal associates and joint ventures. + References No definition available. + Details
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- Details
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Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |