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Share capital and other equity - Ordinary shares (Details) - GBP (£)
 5 Months Ended 12 Months Ended
Dec. 31, 2023
Jun. 16, 2023
May 22, 2023
Feb. 06, 2019
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Jul. 28, 2023
Mar. 28, 2023
Feb. 17, 2023
Aug. 25, 2022
Date of approval                      
Par value £ 1.0769       £ 1.0769 £ 1.0769 £ 1.0769        
Own shares held | Share awards and options                      
Date of approval                      
Par value             £ 1.0769        
Shares held in treasury 12,000,000       12,000,000 12,000,000 13,000,000        
On Market Share Buyback Programme                      
Date of approval                      
Maximum number of ordinary shares purchased under Programme                     1,122,905,024
2022 Authority                      
Date of approval                      
Number of own shares purchased   301,380,053                  
Nominal value of own shares purchased   £ 324,563,134                  
Purchase price per share   £ 2.654456                  
Consideration paid for repurchase of own shares   £ 799,999,997.76                  
Percentage of issued shares repurchased   3.16%                  
Maximum number of ordinary shares purchased under Programme   966,778,930             966,284,391    
Maximum amount for share buy back programme                   £ 800,000,000  
2023 Authority                      
Date of approval                      
Number of own shares purchased         158,956,435            
Nominal value of own shares purchased         £ 171,183,853            
Purchase price per share £ 2.176375                    
Consideration paid for repurchase of own shares £ 345,948,738                    
Percentage of issued shares repurchased 1.75%                    
Maximum number of ordinary shares purchased under Programme     919,858,922                
Maximum amount for share buy back programme               £ 500,000,000      
Off Market Share Buyback Programmes                      
Date of approval                      
Number of own shares purchased     469,200,081                
Nominal value of own shares purchased     £ 505,292,395                
Purchase price per share     £ 2.684                
Number of treasury stock, shares cancelled     336,200,081                
Consideration paid for repurchase of own shares     £ 1,259,333,017                
Percentage of issued shares repurchased     4.95%                
Shares held in treasury     133,000,000                
Ordinary shares                      
Date of approval                      
Par value £ 1.076923076923077       £ 1.076923076923077 £ 1.076923076923077          
Authorized share capital £ 0       £ 0 £ 0          
Authorized share capital granted £ 520,573,270       £ 520,573,270 £ 520,573,270          
Shares held in treasury 187,000,000       187,000,000 187,000,000          
Interim dividend paid           £ 491,000,000 £ 364,000,000        
Interim dividend per share           £ 0.055 £ 0.035        
Final dividend recommended £ 1,000,000,000.0       £ 1,000,000,000.0 £ 1,000,000,000.0 £ 1,000,000,000.0        
Final dividend recommended, per share £ 0.115       £ 0.115 £ 0.115 £ 0.100        
Ordinary shares | Off Market Share Buyback Programmes                      
Date of approval                      
Percentage of outstanding ordinary share capital that company is authorized to repurchase in any 12-month period through off-market transactions       4.99%