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Accounting policies - IFRS 16 Implementation - Additional Information (Detail) - Expected impact of initial application of new standards or interpretations [member]	Jan. 01, 2019 GBP (£) Point
Bottom of range [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Right-of-use asset	£ 2,000,000,000
Lease liability	£ 2,000,000,000
Increase to operating margin | Point	0.4
Decrease to diluted earnings per share	£ (0.013)
Top of range [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Right-of-use asset	2,500,000,000
Lease liability	£ 2,500,000,000
Increase to operating margin | Point	0.6
Decrease to diluted earnings per share	£ (0.016)

X

- Definition

The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2019-01-01
-Name IFRS
-Number 16
-IssueDate 2018-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_47_b&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

The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2019-01-01
-Name IFRS
-Number 16
-IssueDate 2018-01-01
-Paragraph 53
-Subparagraph j
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_53_j&doctype=Standard
-URIDate 2018-03-16

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Change in diluted earnings per share.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Change in operating margin.

+ References

No definition available.

+ Details

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

X

- Definition

Disclosure of expected impact of initial application of new standards or interpretations.

+ References

No definition available.

+ Details

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- Details

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- Details

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