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Financial instruments: valuation - Level 3 Sensitivities of Assets (Details) - GBP (£)
£ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Fair value of assets        
Financial assets £ 702,601 £ 720,053    
Derivatives [Member]        
Fair value of assets        
Financial assets 81,873 99,545    
Financial Assets [Member]        
Fair value of assets        
Financial assets 35,516 30,895    
At fair value        
Fair value of assets        
Financial assets 149,656 162,882    
At fair value | Trading securities [Member]        
Fair value of assets        
Financial assets 16,860 9,922    
At fair value | Derivatives [Member]        
Fair value of assets        
Financial assets 81,873 99,545    
At fair value | Other loans        
Fair value of assets        
Financial assets 803 899    
At fair value | Other equity securities [member]        
Fair value of assets        
Financial assets 18,087 16,861    
At fair value | Level 3        
Fair value of assets        
Financial assets 2,105 2,333 £ 2,059 £ 2,052
Sensitivity favourable 60 80    
Sensitivity unfavourable 100 (100)    
At fair value | Level 3 | Loans        
Fair value of assets        
Financial assets 277 395    
Sensitivity favourable   10    
Sensitivity unfavourable   (10)    
At fair value | Level 3 | Trading securities [Member]        
Fair value of assets        
Financial assets   1    
At fair value | Level 3 | Derivatives [Member]        
Fair value of assets        
Financial assets 930 1,007    
Sensitivity favourable 30 50    
Sensitivity unfavourable 40 (50)    
At fair value | Level 3 | Other loans        
Fair value of assets        
Financial assets 684 727    
Sensitivity unfavourable 30 (10)    
At fair value | Level 3 | Other equity securities [member]        
Fair value of assets        
Financial assets 214 203    
Sensitivity favourable 30 20    
Sensitivity unfavourable £ 30 £ (30)