v3.26.1
SHARE CAPITAL (Details)
£ / shares in Units, £ in Millions
4 Months Ended 6 Months Ended
Jun. 30, 2026
GBP (£)
Vote / shares
£ / shares
shares
Jun. 30, 2026
GBP (£)
Vote / shares
£ / shares
shares
Jun. 30, 2025
GBP (£)
£ / shares
shares
Mar. 12, 2026
GBP (£)
Feb. 26, 2026
GBP (£)
Dec. 31, 2025
GBP (£)
£ / shares
shares
Dec. 31, 2024
GBP (£)
Disclosure of classes of share capital [line items]              
Equity £ 16,440 £ 16,440 £ 15,998     £ 16,484 £ 16,224
Share capital £ 88 88       90  
Repurchase of shares   457 372        
Share buyback programme, allocated amount for 2025              
Disclosure of classes of share capital [line items]              
Share Repurchase Program, Authorized, Amount         £ 500    
Share buyback programme, allocated amount for 2026              
Disclosure of classes of share capital [line items]              
Share Repurchase Program, Authorized, Amount       £ 500      
Number of shares repurchased during the period | shares 131,447,226            
Share capital              
Disclosure of classes of share capital [line items]              
Equity £ 88 88 90     90 £ 91
Ordinary shares              
Disclosure of classes of share capital [line items]              
Share capital £ 88 £ 88 £ 90     £ 90  
Number of shares outstanding | shares 8,820,906,422 8,820,906,422 8,988,533,553     8,952,353,648  
Par value per share | £ / shares £ 0.01 £ 0.01 £ 0.01     £ 0.01  
Votes per share | Vote / shares 1 1