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Financial instruments - valuation - Hierarchy of liabilities (Details) - Recurring fair value measurement - GBP (£)
£ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair value of liabilities      
Liabilities £ 130,578 £ 129,156  
Trading deposits      
Fair value of liabilities      
Liabilities 43,966 43,127  
Debt securities in issue, trading      
Fair value of liabilities      
Liabilities 257 706  
Short positions, trading      
Fair value of liabilities      
Liabilities 10,491 9,803  
Interest rate      
Fair value of liabilities      
Liabilities 31,532 38,483  
Foreign exchange      
Fair value of liabilities      
Liabilities 40,306 33,586  
Other derivatives      
Fair value of liabilities      
Liabilities 244 326  
Debt securities in issue      
Fair value of liabilities      
Liabilities 1,736 1,608  
Other deposits      
Fair value of liabilities      
Liabilities 1,812 1,280  
Financial liabilities, subordinated      
Fair value of liabilities      
Liabilities 234 237  
Level 1      
Fair value of liabilities      
Liabilities £ 8,766 £ 7,936  
As a % of total value liabilities 7.00% 6.00%  
Level 1 | Short positions, trading      
Fair value of liabilities      
Liabilities £ 8,766 £ 7,936  
Level 2      
Fair value of liabilities      
Liabilities £ 121,318 £ 120,529  
As a % of total value liabilities 93.00% 93.00%  
Level 2 | Trading deposits      
Fair value of liabilities      
Liabilities £ 43,966 £ 43,126  
Level 2 | Debt securities in issue, trading      
Fair value of liabilities      
Liabilities 257 706  
Level 2 | Short positions, trading      
Fair value of liabilities      
Liabilities 1,724 1,865  
Level 2 | Interest rate      
Fair value of liabilities      
Liabilities 31,253 38,044  
Level 2 | Foreign exchange      
Fair value of liabilities      
Liabilities 40,240 33,528  
Level 2 | Other derivatives      
Fair value of liabilities      
Liabilities 124 138  
Level 2 | Debt securities in issue      
Fair value of liabilities      
Liabilities 1,733 1,605  
Level 2 | Other deposits      
Fair value of liabilities      
Liabilities 1,787 1,280  
Level 2 | Financial liabilities, subordinated      
Fair value of liabilities      
Liabilities 234 237  
Level 3      
Fair value of liabilities      
Liabilities £ 494 £ 691 £ 976
As a % of total value liabilities 0.00% 1.00%  
Level 3 | Trading deposits      
Fair value of liabilities      
Liabilities   £ 1  
Level 3 | Short positions, trading      
Fair value of liabilities      
Liabilities £ 1 2  
Level 3 | Interest rate      
Fair value of liabilities      
Liabilities 279 439  
Level 3 | Foreign exchange      
Fair value of liabilities      
Liabilities 66 58  
Level 3 | Other derivatives      
Fair value of liabilities      
Liabilities 120 188  
Level 3 | Debt securities in issue      
Fair value of liabilities      
Liabilities 3 £ 3  
Level 3 | Other deposits      
Fair value of liabilities      
Liabilities £ 25