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Financial instruments - valuation - Hierarchy of assets (Details) - At fair value - GBP (£)
£ in Millions
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Fair value of assets        
Assets £ 173,504 £ 165,969    
Trading loans        
Fair value of assets        
Assets 35,179 35,039    
Trading securities        
Fair value of assets        
Assets 21,527 13,878    
Interest rate        
Fair value of assets        
Assets 35,028 37,499    
Foreign exchange        
Fair value of assets        
Assets 37,898 40,797    
Other derivatives        
Fair value of assets        
Assets 84 110    
Other loans        
Fair value of assets        
Assets 565 853    
Other securities        
Fair value of assets        
Assets 43,223 37,793    
Level 1        
Fair value of assets        
Assets £ 42,225 £ 32,715    
As a % of total fair value assets 24.00% 20.00%    
Level 1 | Trading securities        
Fair value of assets        
Assets £ 16,289 £ 8,772    
Level 1 | Other securities        
Fair value of assets        
Assets 25,936 23,943    
Level 2        
Fair value of assets        
Assets £ 129,696 £ 131,572    
As a % of total fair value assets 75.00% 79.00%    
Level 2 | Trading loans        
Fair value of assets        
Assets £ 34,936 £ 34,761    
Level 2 | Trading securities        
Fair value of assets        
Assets 5,238 5,106    
Level 2 | Interest rate        
Fair value of assets        
Assets 34,582 37,026    
Level 2 | Foreign exchange        
Fair value of assets        
Assets 37,749 40,687    
Level 2 | Other derivatives        
Fair value of assets        
Assets 42 63    
Level 2 | Other loans        
Fair value of assets        
Assets 38 288    
Level 2 | Other securities        
Fair value of assets        
Assets 17,111 13,641    
Level 3        
Fair value of assets        
Assets £ 1,583 £ 1,682 £ 1,656 £ 1,961
As a % of total fair value assets 1.00% 1.00%    
Level 3 | Trading loans        
Fair value of assets        
Assets £ 243 £ 278    
Level 3 | Interest rate        
Fair value of assets        
Assets 446 473    
Level 3 | Foreign exchange        
Fair value of assets        
Assets 149 110    
Level 3 | Other derivatives        
Fair value of assets        
Assets 42 47    
Level 3 | Other loans        
Fair value of assets        
Assets 527 565    
Level 3 | Other securities        
Fair value of assets        
Assets £ 176 £ 209