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Share of results of associates - Summary of Share of Results of Associates (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2019
Disclosure of associates [line items] |
Percentage of Ownership After Sale | 40.00%
Kantar [member] |
Disclosure of associates [line items] |
Percentage of Kantar business treated as an associate after sale | 90.00%

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of Kantar business treated as an associate after sale. + References No definition available. + Details
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Namespace Prefix: | wpp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of ownership after sale. + References No definition available. + Details
Name: | wpp_PercentageOfOwnershipAfterSale
Namespace Prefix: | wpp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | wpp_DisposalsAxis=wpp_KantarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |