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Financial instruments: classification - Level 3 Sensitivities of Liabilities (Details) - GBP (£)
£ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Fair value of liabilities        
Specified target level of certainty for assumptions of unobservable inputs 90.00%      
Recurring        
Fair value of liabilities        
Liabilities £ 182,544 £ 236,157    
Sensitivity favourable 40 50    
Sensitivity unfavourable (40) (40)    
Recurring | Deposits        
Fair value of liabilities        
Liabilities 42,531 44,069    
Recurring | Debt securities in issue        
Fair value of liabilities        
Liabilities 1,205 1,408    
Recurring | Derivatives        
Fair value of liabilities        
Liabilities 103,992 160,705    
Sensitivity favourable 40 50    
Sensitivity unfavourable (40) (40)    
Recurring | Other financial liabilities - Debt securities in issue        
Fair value of liabilities        
Liabilities 1,243 1,607    
Recurring | Level 3        
Fair value of liabilities        
Liabilities 685 894 £ 1,008 £ 1,317
Recurring | Level 3 | Deposits        
Fair value of liabilities        
Liabilities 3 7    
Recurring | Level 3 | Debt securities in issue        
Fair value of liabilities        
Liabilities 1      
Recurring | Level 3 | Derivatives        
Fair value of liabilities        
Liabilities £ 681 £ 887