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Financial instruments: valuation - Hierarchy of liabilities (Details) - At fair value - GBP (£)
£ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Fair value of liabilities        
Liabilities £ 118,533 £ 129,156    
Trading deposits        
Fair value of liabilities        
Liabilities 44,151 43,127    
Debt securities in issue, trading        
Fair value of liabilities        
Liabilities 307 706    
Short positions, trading        
Fair value of liabilities        
Liabilities 9,709 9,803    
Interest rate        
Fair value of liabilities        
Liabilities 35,138 38,483    
Foreign exchange        
Fair value of liabilities        
Liabilities 25,441 33,586    
Other derivatives        
Fair value of liabilities        
Liabilities 270 326    
Debt securities in issue        
Fair value of liabilities        
Liabilities 1,639 1,608    
Other deposits        
Fair value of liabilities        
Liabilities 1,649 1,280    
Financial liabilities, subordinated        
Fair value of liabilities        
Liabilities 229 237    
Level 1        
Fair value of liabilities        
Liabilities £ 7,843 £ 7,936    
As a % of total value liabilities 7.00% 6.00%    
Level 1 | Short positions, trading        
Fair value of liabilities        
Liabilities £ 7,843 £ 7,936    
Level 2        
Fair value of liabilities        
Liabilities £ 110,004 £ 120,529    
As a % of total value liabilities 92.00% 93.00%    
Level 2 | Trading deposits        
Fair value of liabilities        
Liabilities £ 44,151 £ 43,126    
Level 2 | Debt securities in issue, trading        
Fair value of liabilities        
Liabilities 307 706    
Level 2 | Short positions, trading        
Fair value of liabilities        
Liabilities 1,864 1,865    
Level 2 | Interest rate        
Fair value of liabilities        
Liabilities 34,698 38,044    
Level 2 | Foreign exchange        
Fair value of liabilities        
Liabilities 25,374 33,528    
Level 2 | Other derivatives        
Fair value of liabilities        
Liabilities 119 138    
Level 2 | Debt securities in issue        
Fair value of liabilities        
Liabilities 1,636 1,605    
Level 2 | Other deposits        
Fair value of liabilities        
Liabilities 1,626 1,280    
Level 2 | Financial liabilities, subordinated        
Fair value of liabilities        
Liabilities 229 237    
Level 3        
Fair value of liabilities        
Liabilities £ 686 £ 691 £ 897 £ 976
As a % of total value liabilities 1.00% 1.00%    
Level 3 | Trading deposits        
Fair value of liabilities        
Liabilities   £ 1    
Level 3 | Short positions, trading        
Fair value of liabilities        
Liabilities £ 2 2    
Level 3 | Interest rate        
Fair value of liabilities        
Liabilities 440 439    
Level 3 | Foreign exchange        
Fair value of liabilities        
Liabilities 67 58    
Level 3 | Other derivatives        
Fair value of liabilities        
Liabilities 151 188    
Level 3 | Financial liabilities (other)        
Fair value of liabilities        
Liabilities 26 3    
Level 3 | Debt securities in issue        
Fair value of liabilities        
Liabilities 3 £ 3    
Level 3 | Other deposits        
Fair value of liabilities        
Liabilities £ 23