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Financial instruments - valuation - Hierarchy of liabilities (Details) - At fair value - GBP (£)
£ in Millions
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Fair value of liabilities        
Liabilities £ 128,989 £ 130,578    
Trading deposits        
Fair value of liabilities        
Liabilities 46,379 43,966    
Debt securities in issue, trading        
Fair value of liabilities        
Liabilities 251 257    
Short positions, trading        
Fair value of liabilities        
Liabilities 12,215 10,491    
Interest rate        
Fair value of liabilities        
Liabilities 28,317 31,532    
Foreign exchange        
Fair value of liabilities        
Liabilities 37,496 40,306    
Other derivatives        
Fair value of liabilities        
Liabilities 170 244    
Debt securities in issue        
Fair value of liabilities        
Liabilities 1,945 1,736    
Other deposits        
Fair value of liabilities        
Liabilities 1,982 1,812    
Financial liabilities, subordinated        
Fair value of liabilities        
Liabilities 234 234    
Level 1        
Fair value of liabilities        
Liabilities £ 9,749 £ 8,766    
As a % of total value liabilities 8.00% 7.00%    
Level 1 | Short positions, trading        
Fair value of liabilities        
Liabilities £ 9,749 £ 8,766    
Level 2        
Fair value of liabilities        
Liabilities £ 118,842 £ 121,318    
As a % of total value liabilities 92.00% 93.00%    
Level 2 | Trading deposits        
Fair value of liabilities        
Liabilities £ 46,379 £ 43,966    
Level 2 | Debt securities in issue, trading        
Fair value of liabilities        
Liabilities 251 257    
Level 2 | Short positions, trading        
Fair value of liabilities        
Liabilities 2,465 1,724    
Level 2 | Interest rate        
Fair value of liabilities        
Liabilities 28,114 31,253    
Level 2 | Foreign exchange        
Fair value of liabilities        
Liabilities 37,420 40,240    
Level 2 | Other derivatives        
Fair value of liabilities        
Liabilities 107 124    
Level 2 | Debt securities in issue        
Fair value of liabilities        
Liabilities 1,942 1,733    
Level 2 | Other deposits        
Fair value of liabilities        
Liabilities 1,930 1,787    
Level 2 | Financial liabilities, subordinated        
Fair value of liabilities        
Liabilities 234 234    
Level 3        
Fair value of liabilities        
Liabilities £ 398 £ 494 £ 686 £ 691
As a % of total value liabilities 0.00% 0.00%    
Level 3 | Short positions, trading        
Fair value of liabilities        
Liabilities £ 1 £ 1    
Level 3 | Interest rate        
Fair value of liabilities        
Liabilities 203 279    
Level 3 | Foreign exchange        
Fair value of liabilities        
Liabilities 76 66    
Level 3 | Other derivatives        
Fair value of liabilities        
Liabilities 63 120    
Level 3 | Debt securities in issue        
Fair value of liabilities        
Liabilities 3 3    
Level 3 | Other deposits        
Fair value of liabilities        
Liabilities £ 52 £ 25