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Share of results of associates - Summary of Share of Results of Associates (Parenthetical) (Detail)	12 Months Ended
	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%

X

- 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

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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

X

- 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

X

- Details

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