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Financial instruments: valuation - Level 3 Sensitivities of Liabilities (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2022
Fair value of liabilities      
Liabilities £ 167,807   £ 149,577
Specified target level of certainty for assumptions of unobservable inputs     90.00%
Derivatives      
Fair value of liabilities      
Financial liabilities 100,835   £ 94,047
Liabilities 100,835   94,047
Other financial liabilities      
Fair value of liabilities      
Financial liabilities 49,326   49,107
Level 3      
Fair value of liabilities      
Liabilities 609 £ 894 976
Sensitivity favourable 30 30  
Sensitivity unfavourable 30 30  
Level 3 | Deposits      
Fair value of liabilities      
Liabilities 2   1
Level 3 | Short Positions      
Fair value of liabilities      
Liabilities 1    
Level 3 | Derivatives      
Fair value of liabilities      
Liabilities 606   £ 975
Sensitivity favourable 30 30  
Sensitivity unfavourable £ 30 £ 30