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Financial instruments - valuation - Level 3 Sensitivities of Liabilities (Details) - GBP (£)
£ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Fair value of liabilities        
Specified target level of certainty for assumptions of unobservable inputs 90.00%      
At fair value        
Fair value of liabilities        
Liabilities £ 128,989 £ 130,578    
At fair value | Trading deposits        
Fair value of liabilities        
Liabilities 46,379 43,966    
At fair value | Short positions, trading        
Fair value of liabilities        
Liabilities 12,215 10,491    
At fair value | Interest rate        
Fair value of liabilities        
Liabilities 28,317 31,532    
At fair value | Foreign exchange        
Fair value of liabilities        
Liabilities 37,496 40,306    
At fair value | Other derivatives        
Fair value of liabilities        
Liabilities 170 244    
At fair value | Debt securities in issue        
Fair value of liabilities        
Liabilities 1,945 1,736    
At fair value | Other deposits        
Fair value of liabilities        
Liabilities 1,982 1,812    
At fair value | Level 3        
Fair value of liabilities        
Liabilities 398 494 £ 686 £ 691
Sensitivity favourable 20 30    
Sensitivity unfavourable (30) (40)    
At fair value | Level 3 | Short positions, trading        
Fair value of liabilities        
Liabilities 1 1    
At fair value | Level 3 | Derivatives        
Fair value of liabilities        
Liabilities 342 465 £ 658 £ 685
At fair value | Level 3 | Interest rate        
Fair value of liabilities        
Liabilities 203 279    
Sensitivity favourable 10 10    
Sensitivity unfavourable (10) (10)    
At fair value | Level 3 | Foreign exchange        
Fair value of liabilities        
Liabilities 76 66    
At fair value | Level 3 | Other derivatives        
Fair value of liabilities        
Liabilities 63 120    
Sensitivity favourable   10    
Sensitivity unfavourable   (10)    
At fair value | Level 3 | Debt securities in issue        
Fair value of liabilities        
Liabilities 3 3    
At fair value | Level 3 | Other deposits        
Fair value of liabilities        
Liabilities 52 25    
Sensitivity favourable 10 10    
Sensitivity unfavourable £ (20) £ (20)