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Segment information - Contributions by Reportable Segments (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of operating segments [line items]      
Employee benefits expense £ 7,761 £ 8,137 £ 8,166
Goodwill impairment 237 63 38
Reportable Segments | Operating Segments      
Disclosure of operating segments [line items]      
Employee benefits expense 7,761 8,137 8,166
Depreciation and amortisation 401 447 451
Goodwill impairment 237 63 38
Reportable Segments | Global Integrated Agencies | Operating Segments      
Disclosure of operating segments [line items]      
Employee benefits expense 6,330 6,491 6,530
Depreciation and amortisation 327 361 370
Goodwill impairment 158 40 0
Reportable Segments | Public Relations | Operating Segments      
Disclosure of operating segments [line items]      
Employee benefits expense 761 821 815
Depreciation and amortisation 35 40 37
Goodwill impairment 12 0 4
Reportable Segments | Specialist Agencies | Operating Segments      
Disclosure of operating segments [line items]      
Employee benefits expense 670 825 821
Depreciation and amortisation 39 46 44
Goodwill impairment £ 67 £ 23 £ 34