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Bank overdrafts, bonds and bank loans - Additional Information (Detail) - GBP (£) £ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of bank overdraft bonds and bank loans [line items] |  |
Carrying amount of bank loans | £ 110.4 | £ 186.8
Corporate bond [member] |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |
Fair value of corporate bonds | £ 4,439.8 | £ 5,965.7

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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 2019-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying amount of bank loans. + References No definition available. + Details
Name: | wpp_CarryingAmountOfBankLoans
Namespace Prefix: | wpp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disclosure of bank overdraft bonds and bank loans. + References No definition available. + Details
Name: | wpp_DisclosureOfBankOverdraftBondsAndBankLoansLineItems
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: |