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Share-based payments - Movements and Weighted-average Exercise Price for Options Granted (Details)
number in Millions
 12 Months Ended
Dec. 31, 2024
$ / shares
Dec. 31, 2024
shares
$ / shares
Dec. 31, 2024
$ / shares
Dec. 31, 2024
$ / shares
Dec. 31, 2024
£ / shares
$ / shares
Dec. 31, 2023
shares
$ / shares
Dec. 31, 2023
$ / shares
Dec. 31, 2023
$ / shares
Dec. 31, 2023
£ / shares
$ / shares
Dec. 31, 2022
shares
$ / shares
Dec. 31, 2022
shares
£ / shares
Dec. 31, 2024
£ / shares
Dec. 31, 2023
£ / shares
Disclosure of terms and conditions of share-based payment arrangement [Line items]                          
Options granted, Beginning balance (in shares)       25       23          
Options granted, Granted (in shares)       8       5          
Exercise of share options (in shares)       0       0          
Options granted, Forfeited (in shares)       (5)       (3)          
Options granted, Ending balance (in shares)       28       25   23 23    
Options granted, Exercisable (in shares) 12 12 12 12 12 7 7 7 7     12 7
Weighted average contractual life (Months) 85 months                        
Bottom of Range                          
Disclosure of terms and conditions of share-based payment arrangement [Line items]                          
Exercise price (in dollars per share)                       £ 44.1  
Top of Range                          
Disclosure of terms and conditions of share-based payment arrangement [Line items]                          
Exercise price (in dollars per share)                       £ 115.9  
WWOP                          
Disclosure of terms and conditions of share-based payment arrangement [Line items]                          
Options granted, Beginning balance (in shares)   650,825   1       2          
Options granted, Granted (in shares)       0       0          
Exercise of share options (in shares)       0       0          
Options granted, Forfeited (in shares)       (1)       (1)          
Options granted, Ending balance (in shares)   0   0   650,825   1   2 2    
Options granted, Exercisable (in shares) 0 0 0 0 0 0 0 0 0     0 0
Exercise price (in dollars per share) | $ / shares           $ 102.67 $ 102.67 $ 102.67 $ 102.67        
WSOP                          
Disclosure of terms and conditions of share-based payment arrangement [Line items]                          
Options granted, Beginning balance (in shares)       24       21          
Options granted, Granted (in shares)       8       5          
Exercise of share options (in shares)       0       0          
Options granted, Forfeited (in shares)       (4)       (2)          
Options granted, Ending balance (in shares)       28       24   21 21    
Options granted, Exercisable (in shares) 12 12 12 12 12 7 7 7 7     12 7
Ordinary shares                          
Disclosure of terms and conditions of share-based payment arrangement [Line items]                          
Exercise of share options (in shares) | shares           85,900              
Weighted average contractual life (Months) 82 months                        
Ordinary shares | Bottom of Range                          
Disclosure of terms and conditions of share-based payment arrangement [Line items]                          
Exercise price (in pound per share)                       £ 7.07  
Ordinary shares | Top of Range                          
Disclosure of terms and conditions of share-based payment arrangement [Line items]                          
Exercise price (in pound per share)                       17.06  
Ordinary shares | WWOP                          
Disclosure of terms and conditions of share-based payment arrangement [Line items]                          
Exercise of share options (in shares) | shares   248,625               125,700 125,700    
Weighted-average exercise price for options, 1 January (in pound per share)         £ 13       $ 13        
Weighted-average exercise price for options, Granted (in pound per share)         0       0        
Weighted-average exercise price for options, Exercised (in pound per share)         0       0        
Weighted-average exercise price for options, Forfeited (in pound per share)         13       13        
Weighted-average exercise price for options, Outstanding 31 December (in pound per share)         0       13   £ 13    
Weighted-average exercise price for options, Exercisable (in pound per share)                       0 £ 0
Ordinary shares | WSOP                          
Disclosure of terms and conditions of share-based payment arrangement [Line items]                          
Weighted-average exercise price for options, 1 January (in pound per share)         10       10        
Weighted-average exercise price for options, Granted (in pound per share)         8       0        
Weighted-average exercise price for options, Exercised (in pound per share)         7       8        
Weighted-average exercise price for options, Forfeited (in pound per share)         9       10        
Weighted-average exercise price for options, Outstanding 31 December (in pound per share)         £ 9       $ 10   £ 10    
Weighted-average exercise price for options, Exercisable (in pound per share)                       £ 11 £ 0
American depository receipts | WWOP                          
Disclosure of terms and conditions of share-based payment arrangement [Line items]                          
Weighted-average exercise price for options, 1 January (in dollars per share) | $ / shares     $ 103       $ 106            
Weighted-average exercise price for options, Granted (in dollars per share) | $ / shares     0       0            
Weighted-average exercise price for options, Granted (in dollars per share) | $ / shares     0       0            
Weighted-average exercise price for options, Forfeited (in dollars per share) | $ / shares     103       110            
Weighted-average exercise price for options, Outstanding 31 December (in dollars per share) | $ / shares     0       103     $ 106      
Weighted-average exercise price for options, Exercisable (in dollars per share) | $ / shares $ 0 $ 0 0 $ 0 £ 0 $ 0 0 $ 0 $ 0        
American depository receipts | WSOP                          
Disclosure of terms and conditions of share-based payment arrangement [Line items]                          
Weighted-average exercise price for options, 1 January (in dollars per share) | $ / shares     63       68            
Weighted-average exercise price for options, Granted (in dollars per share) | $ / shares     54       0            
Weighted-average exercise price for options, Granted (in dollars per share) | $ / shares     45       49            
Weighted-average exercise price for options, Forfeited (in dollars per share) | $ / shares     61       66            
Weighted-average exercise price for options, Outstanding 31 December (in dollars per share) | $ / shares     61       63     $ 68      
Weighted-average exercise price for options, Exercisable (in dollars per share) | $ / shares $ 73 $ 73 $ 73 $ 73 £ 73 $ 44 $ 44 $ 44 $ 44