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Goodwill and acquisitions (Detail) - GBP (£) £ in Millions | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
Goodwill and acquisitions [Abstract] |  |
(Decrease) increase in Goodwill by subsidiary undertaking | £ 625.2 | £ (63.7)

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- Definition The increase (decrease) in goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2022-03-24 -Paragraph B67 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2022-en-r&anchor=para_B67_d&doctype=Appendix&subtype=B -URIDate 2022-03-24 + Details
Name: | ifrs-full_ChangesInGoodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Goodwill and acquisitions + References No definition available. + Details
Name: | wpp_GoodwillAndAcquisitionsAbstract
Namespace Prefix: | wpp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration