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Debt financing - Additional Information (Detail) - GBP (£) £ in Millions	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Disclosure of bank overdraft bonds and bank loans [line items]
Carrying amount of corporate bonds	£ 5,535.2	£ 6,051.6	£ 5,959.5
Carrying amount of bank loans	580.1	186.8	624.6
Corporate bond [member]
Disclosure of bank overdraft bonds and bank loans [line items]
Fair value of corporate bonds	£ 5,783.4	£ 5,965.7	£ 6,035.1

X

- 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 2018-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard
-URIDate 2018-03-16

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Carrying amount of bank loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	wpp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Carrying amount of corporate bonds

+ References

No definition available.

+ Details

Name:	wpp_CarryingAmountOfCorporateBonds
Namespace Prefix:	wpp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

X

- Details

Name:	ifrs-full_ClassesOfFinancialLiabilitiesAxis=wpp_CorporateBondMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: