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Authorised and issued share capital - Summary of Authorized and Issued Share Capital (Details)
£ / shares in Units, £ in Millions, number in Millions
 12 Months Ended
Dec. 31, 2024
GBP (£)
£ / shares
shares
Dec. 31, 2023
GBP (£)
shares
Dec. 31, 2022
GBP (£)
shares
Dec. 31, 2021
GBP (£)
shares
Disclosure of classes of share capital [line items]        
Exercise of share options (in shares) 0 0    
Issued and fully paid capital, Beginning balance £ 114      
Share cancellations 0 [1]   £ (807)  
Issued and fully paid capital, Ending balance £ 109 £ 114    
Ordinary shares        
Disclosure of classes of share capital [line items]        
Equity ordinary shares, authorised (in shares) | shares 1,750,000,000 1,750,000,000 1,750,000,000 1,750,000,000
Nominal value of authorised shares £ 175 £ 175 £ 175 £ 175
Number of shares issued and fully paid, Beginning balance (in shares) | shares 1,141,513,196 1,141,427,296 1,224,459,550  
Exercise of share options (in shares) | shares   85,900    
Share cancellations (in shares) | shares (50,367,570)   (83,157,954)  
Number of shares issued and fully paid, Ending balance (in shares) | shares 1,091,394,251 1,141,513,196 1,141,427,296  
Issued and fully paid capital, Beginning balance £ 114 £ 114 £ 122  
Exercise of share options 0 0 0  
Share cancellations (5)   (8)  
Issued and fully paid capital, Ending balance £ 109 £ 114 £ 114  
Par value per share (in pound sterling per share) | £ / shares £ 0.10      
[1]
5In December 2024, WPP cancelled 50,367,570 treasury shares.