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Restructuring and Integration Costs - Additional Information (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Expense Of Restructuring Activities [Line Items]      
Employee benefit costs £ 0 £ (26) £ 315
Restructuring and integration related depreciation and impairment (credit) cost 0 39 220
Restructuring and integration costs (reversal) associated with other operating expenses £ 0 (15) £ 237
Machinery      
Expense Of Restructuring Activities [Line Items]      
Reversal of impairment loss   4  
Quantum provision      
Expense Of Restructuring Activities [Line Items]      
Restructuring and integration related depreciation and impairment (credit) cost   (7)  
Macro-economic      
Expense Of Restructuring Activities [Line Items]      
Restructuring and integration related depreciation and impairment (credit) cost   46  
Site clean up costs      
Expense Of Restructuring Activities [Line Items]      
Restructuring and integration costs (reversal) associated with other operating expenses   £ (3)