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Financial instruments: valuation - Level 3 Sensitivities of Liabilities (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 liabilities        
Financial liabilities £ 667,803 £ 683,557    
Specified target level of certainty for assumptions of unobservable inputs 90.00%      
Derivatives        
Fair value of liabilities        
Financial liabilities £ 77,246 94,047    
Other financial liabilities        
Fair value of liabilities        
Financial liabilities 55,748 49,107    
At fair value        
Fair value of liabilities        
Financial liabilities 136,053 149,577    
At fair value | Derivatives        
Fair value of liabilities        
Financial liabilities 77,246 94,047    
At fair value | Level 3        
Fair value of liabilities        
Financial liabilities 897 976 £ 751 £ 609
Sensitivity favourable (30) (30)    
Sensitivity unfavourable (30) 30    
At fair value | Level 3 | Deposits        
Fair value of liabilities        
Financial liabilities 1 1    
At fair value | Level 3 | Debt securities in issue        
Fair value of liabilities        
Financial liabilities 1      
At fair value | Level 3 | Derivatives        
Fair value of liabilities        
Financial liabilities 895 975    
Sensitivity favourable (30) (30)    
Sensitivity unfavourable £ (30) £ 30