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Other reserves - Summary of Other Reserves (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reserves within equity [line items]      
Beginning balance £ 3,833 £ 4,160 £ 4,068
(Loss)/gain on net investment hedges (3) 108 (141)
Fair value gain arising on hedging instruments [1] (8) 0 0
Amounts reclassified to profit or loss 58 44 (38)
Share of other comprehensive (loss)/income of associates 0 (1) 51
Share cancellations 0 [2]   (807)
Net movement in own shares held by ESOP Trusts (82) (54) (55)
Net derecognition of liabilities in respect of put options 42 228 [3] 62
Ending balance 3,734 3,833 4,160
Other reserves      
Disclosure of reserves within equity [line items]      
Beginning balance 187 285 (336)
Foreign exchange differences on translation of foreign operations (70) (404) 408
(Loss)/gain on net investment hedges (3) 108 (141)
Fair value gain arising on hedging instruments (35) (43) 38
Amounts reclassified to profit or loss 58 44 (38)
Share of other comprehensive (loss)/income of associates   (1) 32
Cost of hedging (8)    
Share cancellations 5 [2]   8
Net movement in own shares held by ESOP Trusts (8)    
Net derecognition of liabilities in respect of put options 25 198 [3] 102
Share purchases – close period commitments     212
Ending balance 151 187 285
Capital redemption reserve      
Disclosure of reserves within equity [line items]      
Beginning balance 22 22 14
Share cancellations 5   8
Ending balance 27 22 22
Equity reserve      
Disclosure of reserves within equity [line items]      
Beginning balance (65) (263) (577)
Net derecognition of liabilities in respect of put options 25 198 102
Share purchases – close period commitments     212
Ending balance (40) (65) (263)
Hedging reserve      
Disclosure of reserves within equity [line items]      
Beginning balance 1   0
Fair value gain arising on hedging instruments (35) (43) 38
Amounts reclassified to profit or loss 58 44 (38)
Cost of hedging (8)    
Ending balance 16 1  
Translation reserve      
Disclosure of reserves within equity [line items]      
Beginning balance 229 526 227
Foreign exchange differences on translation of foreign operations (70) (404) 408
(Loss)/gain on net investment hedges (3) 108 (141)
Share of other comprehensive (loss)/income of associates   (1) 32
Net movement in own shares held by ESOP Trusts (8)    
Ending balance £ 148 £ 229 £ 526
[1] During 2024, WPP entered into hedging arrangements for which the foreign currency basis within the hedging instrument was excluded from the hedge designation, and identified as a cost of hedging, as permitted by IFRS.
[2]
5In December 2024, WPP cancelled 50,367,570 treasury shares.
[3] During 2023, WPP sold a portion of its ownership of FGS Global to KKR. As part of this transaction, the previous put option granted to management shareholders was derecognised.