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Costs of services and general and administrative costs - Auditor's Remuneration (Detail) (Parenthetical) £ in Millions	12 Months Ended
	Dec. 31, 2019 GBP (£)
Other Services [member]
Disclosure Of Information About Operating Cost [line items]
Auditors remuneration includes true up	£ 3.5

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- Definition

Auditors remuneration includes true up.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Disclosure of information about operating cost line items.

+ References

No definition available.

+ Details

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Namespace Prefix:	wpp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: