SEGMENT INFORMATION - Additional Information (Details)	12 Months Ended
Dec. 31, 2025 segment
General Information and Statement of IFRS Compliance [Abstract]
Number of reportable segments	3

General Information and Statement of IFRS Compliance Abstract

No definition available.

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