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Financial instruments - valuation - Level 3 Sensitivities of Liabilities (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair value of liabilities      
Specified target level of certainty for assumptions of unobservable inputs 90.00%    
Recurring fair value measurement      
Fair value of liabilities      
Liabilities £ 130,578 £ 129,156  
Recurring fair value measurement | Trading deposits      
Fair value of liabilities      
Liabilities 43,966 43,127  
Recurring fair value measurement | Short positions, trading      
Fair value of liabilities      
Liabilities 10,491 9,803  
Recurring fair value measurement | Interest rate      
Fair value of liabilities      
Liabilities 31,532 38,483  
Recurring fair value measurement | Foreign exchange      
Fair value of liabilities      
Liabilities 40,306 33,586  
Recurring fair value measurement | Other derivatives      
Fair value of liabilities      
Liabilities 244 326  
Recurring fair value measurement | Debt securities in issue      
Fair value of liabilities      
Liabilities 1,736 1,608  
Recurring fair value measurement | Other deposits      
Fair value of liabilities      
Liabilities 1,812 1,280  
Recurring fair value measurement | Level 3      
Fair value of liabilities      
Liabilities 494 691 £ 976
Sensitivity favourable 30 20  
Sensitivity unfavourable (40) (20)  
Recurring fair value measurement | Level 3 | Trading deposits      
Fair value of liabilities      
Liabilities   1  
Recurring fair value measurement | Level 3 | Short positions, trading      
Fair value of liabilities      
Liabilities 1 2  
Recurring fair value measurement | Level 3 | Derivatives      
Fair value of liabilities      
Liabilities 465 685 £ 975
Recurring fair value measurement | Level 3 | Interest rate      
Fair value of liabilities      
Liabilities 279 439  
Sensitivity favourable 10 10  
Sensitivity unfavourable (10) (10)  
Recurring fair value measurement | Level 3 | Foreign exchange      
Fair value of liabilities      
Liabilities 66 58  
Recurring fair value measurement | Level 3 | Other derivatives      
Fair value of liabilities      
Liabilities 120 188  
Sensitivity favourable 10 10  
Sensitivity unfavourable (10) (10)  
Recurring fair value measurement | Level 3 | Debt securities in issue      
Fair value of liabilities      
Liabilities 3 £ 3  
Recurring fair value measurement | Level 3 | Other deposits      
Fair value of liabilities      
Liabilities 25    
Sensitivity favourable 10    
Sensitivity unfavourable £ (20)