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Financial instruments: valuation - Hierarchy of assets (Details) - At fair value - GBP (£)
£ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Fair value of assets        
Assets £ 142,163 £ 153,862    
Trading loans        
Fair value of assets        
Assets 26,238 33,597    
Trading securities        
Fair value of assets        
Assets 19,736 11,954    
Interest rate        
Fair value of assets        
Assets 40,925 44,563    
Foreign exchange        
Fair value of assets        
Assets 26,446 34,161    
Other derivatives        
Fair value of assets        
Assets 143 180    
Other loans        
Fair value of assets        
Assets 768 765    
Other securities        
Fair value of assets        
Assets 27,907 28,642    
Level 1        
Fair value of assets        
Assets £ 33,066 £ 26,296    
As a % of total fair value assets 23.00% 17.00%    
Level 1 | Trading securities        
Fair value of assets        
Assets £ 15,097 £ 8,447    
Level 1 | Interest rate        
Fair value of assets        
Assets   1    
Level 1 | Other securities        
Fair value of assets        
Assets 17,969 17,848    
Level 2        
Fair value of assets        
Assets £ 107,441 £ 125,605    
As a % of total fair value assets 76.00% 82.00%    
Level 2 | Trading loans        
Fair value of assets        
Assets £ 26,008 £ 33,388    
Level 2 | Trading securities        
Fair value of assets        
Assets 4,639 3,493    
Level 2 | Interest rate        
Fair value of assets        
Assets 40,364 43,912    
Level 2 | Foreign exchange        
Fair value of assets        
Assets 26,314 34,096    
Level 2 | Other derivatives        
Fair value of assets        
Assets 74 72    
Level 2 | Other loans        
Fair value of assets        
Assets 352 108    
Level 2 | Other securities        
Fair value of assets        
Assets 9,690 10,536    
Level 3        
Fair value of assets        
Assets £ 1,656 £ 1,961 £ 2,105 £ 2,333
As a % of total fair value assets 1.00% 1.00%    
Level 3 | Trading loans        
Fair value of assets        
Assets £ 230 £ 209    
Level 3 | Trading securities        
Fair value of assets        
Assets   14    
Level 3 | Interest rate        
Fair value of assets        
Assets 561 650    
Level 3 | Foreign exchange        
Fair value of assets        
Assets 132 65    
Level 3 | Other derivatives        
Fair value of assets        
Assets 69 108    
Level 3 | Other loans        
Fair value of assets        
Assets 416 657    
Level 3 | Other securities        
Fair value of assets        
Assets £ 248 £ 258