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Disposals of subsidiaries (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 02, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of Detailed information Amounts About In Discontinued Operations Included In Profit [Line Items]        
Goodwill   £ 7,610 £ 8,389 £ 8,453
Other intangible assets   737 850 1,452
Right-of-use assets   1,385 1,382 1,528
Cash and cash equivalents   2,638 2,218 2,492
Accrued income and unbilled media   3,188 3,151  
Borrowings   (4,328) (4,721)  
Lease liability at end of year   (2,020) (2,154) (2,210)
Trade and other payables   (12,272) (12,541)  
Net assets   3,734 3,833  
Non-controlling interests   (259) (457)  
Gain on disposal before income tax   £ 1,031 £ 346 £ 1,160
Discontinued operations        
Disclosure of Detailed information Amounts About In Discontinued Operations Included In Profit [Line Items]        
Goodwill £ 448      
Other intangible assets 60      
Right-of-use assets 59      
Cash and cash equivalents 93      
Trade and other receivables 106      
Accrued income and unbilled media 24      
Other assets 29      
Total assets 819      
Borrowings (93)      
Lease liability at end of year (74)      
Deferred income (16)      
Trade and other payables (93)      
Deferred tax liabilities (33)      
Other liabilities (3)      
Total liabilities (312)      
Net assets 507      
Non-controlling interests (100)      
Net assets disposed 407      
Consideration received 613      
Gain on disposal before income tax and reclassification of foreign currency translation reserve 206      
Reclassification of foreign currency translation reserve 69      
Gain on disposal before income tax 275      
Income tax expense on gain (79)      
Gain on disposal after income tax £ 196