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Financial instruments: valuation - Hierarchy of assets (Details) - Recurring fair value measurement - GBP (£)
£ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair value of assets      
Assets £ 153,862 £ 162,882  
Trading loans      
Fair value of assets      
Assets 33,597 35,655  
Trading securities      
Fair value of assets      
Assets 11,954 9,922  
Interest rate      
Fair value of assets      
Assets 44,563 53,480  
Foreign exchange      
Fair value of assets      
Assets 34,161 45,829  
Other      
Fair value of assets      
Assets 180 236  
Other loans      
Fair value of assets      
Assets 765 899  
Other securities      
Fair value of assets      
Assets 28,642 16,861  
Level 1      
Fair value of assets      
Assets £ 26,296 £ 17,848  
As a % of total value assets 17.00% 11.00%  
Level 1 | Trading securities      
Fair value of assets      
Assets £ 8,447 £ 7,463  
Level 1 | Interest rate      
Fair value of assets      
Assets 1 5  
Level 1 | Other securities      
Fair value of assets      
Assets 17,848 10,380  
Level 2      
Fair value of assets      
Assets £ 125,605 £ 142,701  
As a % of total value assets 82.00% 88.00%  
Level 2 | Trading loans      
Fair value of assets      
Assets £ 33,388 £ 35,260  
Level 2 | Trading securities      
Fair value of assets      
Assets 3,493 2,458  
Level 2 | Interest rate      
Fair value of assets      
Assets 43,912 52,764  
Level 2 | Foreign exchange      
Fair value of assets      
Assets 34,096 45,715  
Level 2 | Other      
Fair value of assets      
Assets 72 54  
Level 2 | Other loans      
Fair value of assets      
Assets 108 172  
Level 2 | Other securities      
Fair value of assets      
Assets 10,536 6,278  
Level 3      
Fair value of assets      
Assets £ 1,961 £ 2,333 £ 2,052
As a % of total value assets 1.00% 1.00%  
Level 3 | Trading loans      
Fair value of assets      
Assets £ 209 £ 395  
Level 3 | Trading securities      
Fair value of assets      
Assets 14 1  
Level 3 | Interest rate      
Fair value of assets      
Assets 650 711  
Level 3 | Foreign exchange      
Fair value of assets      
Assets 65 114  
Level 3 | Other      
Fair value of assets      
Assets 108 182  
Level 3 | Other loans      
Fair value of assets      
Assets 657 727  
Level 3 | Other securities      
Fair value of assets      
Assets £ 258 £ 203