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Intangible assets - product development (Tables)
 12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Summary of Intangible Assets Product Development
All figures in £ millions
   
2021
     
2020
  
Cost
                  
At 1 January
   
 
2,514
 
      2,275  
Exchange differences
      —          (48 ) 
Additions
   
 
287
 
      323  
Disposals and retirements
   
 
(92
) 
      (31 ) 
Disposal of subsidiary
   
 
(9
) 
      —    
Transfers
   
 
(2
) 
      (5 ) 
    
 
 
     
 
 
  
At 31 December
   
 
2,698
 
   
 
 2,514
 
    
 
 
     
 
 
  
Amortisation
                  
At 1 January
   
 
(1,609
) 
      (1,405 ) 
Exchange differences
   
 
(3
) 
      45  
Charge for the year
   
 
(260
) 
      (280 ) 
Impairment
   
 
(19
) 
      —    
Disposals and retirements
   
 
92
 
      31  
Disposal of subsidiary
   
 
3
 
      —    
Transfers
   
 
(8
) 
      —    
    
 
 
     
 
 
  
At 31 December
   
 
(1,804
) 
   
 
 (1,609 )
 
    
 
 
     
 
 
  
Carrying amounts at 31 December 2021
   
 
894
 
   
 
 905