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Financial instruments - valuation - Level 3 Sensitivities of Liabilities (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair value of liabilities      
Specified Target Level Of Certainty For Unobservable Inputs 90.00%    
Recurring      
Fair value of liabilities      
Liabilities £ 236,157 £ 223,810  
Recurring | Deposits      
Fair value of liabilities      
Liabilities 44,069 51,000  
Recurring | Debt securities in issue      
Fair value of liabilities      
Liabilities 1,408 1,762  
Recurring | Derivatives      
Fair value of liabilities      
Liabilities 160,705 146,879  
Recurring | Other financial liabilities - Debt securities in issue      
Fair value of liabilities      
Liabilities 1,607 2,258  
Recurring | Level 3      
Fair value of liabilities      
Liabilities 894 1,317 £ 1,957
Sensitivity favourable 50 110  
Sensitivity unfavourable (40) (100)  
Recurring | Level 3 | Deposits      
Fair value of liabilities      
Liabilities 7 56  
Recurring | Level 3 | Debt securities in issue      
Fair value of liabilities      
Liabilities   59  
Recurring | Level 3 | Derivatives      
Fair value of liabilities      
Liabilities 887 1,061  
Sensitivity favourable 50 100  
Sensitivity unfavourable £ (40) (90)  
Recurring | Level 3 | Other financial liabilities - Debt securities in issue      
Fair value of liabilities      
Liabilities   141  
Sensitivity favourable   10  
Sensitivity unfavourable   £ (10)