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Intangible assets - Summary of Movement of Goodwill (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of changes in goodwill [abstract]      
Beginning balance £ 8,389 £ 8,453  
Impairment losses for the year 237 63 £ 38
Ending balance 7,610 8,389 8,453
Cost      
Reconciliation of changes in goodwill [abstract]      
Beginning balance 11,979 12,144  
Additions 27 319  
Disposals (466) 0  
Exchange adjustments (146) (484)  
Ending balance 11,394 11,979 12,144
Accumulated impairment losses      
Reconciliation of changes in goodwill [abstract]      
Beginning balance (3,590) (3,691)  
Impairment losses for the year 237 63 38
Exchange adjustments (43) (164)  
Ending balance £ (3,784) £ (3,590) £ (3,691)