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Cash and cash equivalents and debt financing - Additional information (Detail) - GBP (£) £ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Corporate bond [member] |  |
Cash Reconciliation [Line Items] |  |
Fair value of corporate bonds | £ 4,119.2 | £ 4,790.3

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- Definition The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_25&doctype=Standard -URIDate 2022-03-24 + Details
Name: | ifrs-full_FinancialLiabilitiesAtFairValue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Cash Reconciliation + References No definition available. + Details
Name: | wpp_CashReconciliationLineItems
Namespace Prefix: | wpp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfFinancialLiabilitiesAxis=wpp_CorporateBondMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |