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Intangible assets - product development (Tables)
 12 Months Ended
Dec. 31, 2023
Text block [abstract]  
Summary of Intangible Assets Product Development
All figures in £ millions   
 
    2023
         2022  
Cost
     
At 1 January   
 
2,918
 
     2,698  
Exchange differences   
 
(121
) 
     235  
Additions   
 
300
 
     357  
Disposals and retirements   
 
(550
) 
     (191 ) 
Disposal of businesses (note 31)   
 
(29
) 
     (186 ) 
Transfers   
 
(1
) 
     5  
At 31 December
   
 
2,517
 
     2,918  
Amortisation
     
At 1 January   
 
(1,943
) 
     (1,804 ) 
Exchange differences   
 
92
 
     (174 ) 
Charge for the year   
 
(280
) 
     (288 ) 
Impairment   
 
(4
) 
     (15 ) 
Disposals and retirements   
 
550
 
     191  
Disposal of businesses (note 31)   
 
14
 
     147  
Transfers   
 
1
 
     –  
At 31 December
   
 
(1,570
) 
     (1,943 ) 
Carrying amounts at 31 December
   
 
947
 
     975