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Segmental analysis - 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]      
Revenue £ 14,741 £ 14,845 £ 14,429
Revenue less pass-through costs
Headline operating profit 1,707 1,750 1,742
Adjusting items within IFRS operating profit (382) (1,219) (384)
Financing items (330) (255) (138)
Earnings/(losses) from associates 36 70 (60)
Profit before taxation 1,031 346 1,160
Reportable Segments | Operating Segments | Global Integrated Agencies      
Disclosure of operating segments [line items]      
Revenue 12,562 12,532 12,133
Revenue less pass-through costs 9,384 9,751 9,684
Headline operating profit 1,482 1,480 1,427
Reportable Segments | Operating Segments | Public Relations      
Disclosure of operating segments [line items]      
Revenue 1,156 1,262 1,233
Revenue less pass-through costs 1,089 1,180 1,161
Headline operating profit 166 191 192
Reportable Segments | Operating Segments | Specialist Agencies      
Disclosure of operating segments [line items]      
Revenue 1,023 1,051 1,063
Revenue less pass-through costs 886 929 955
Headline operating profit £ 59 £ 79 £ 123