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v3.20.1

Trade and other receivables - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Trade and other receivables [abstract] |  |  |
Allowance for bad and doubtful debts as a percentage of gross trade accounts receivables | 1.60% | 1.40% | 1.10%

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- References No definition available. + Details
Name: | ifrs-full_TradeAndOtherReceivablesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Allowance for bad and doubtful debts percentage. + References No definition available. + Details
Name: | wpp_AllowanceForBadAndDoubtfulDebtsPercentage
Namespace Prefix: | wpp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration