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Financial instruments: valuation - Level 3 Sensitivities of Liabilities (Details) - GBP (£)
£ in Millions
12 Months Ended
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 £ 129,156 £ 149,577
Recurring fair value measurement | Interest rate    
Fair value of liabilities    
Liabilities 38,483 48,535
Recurring fair value measurement | Foreign exchange    
Fair value of liabilities    
Liabilities 33,586 45,237
Recurring fair value measurement | Other    
Fair value of liabilities    
Liabilities 326 275
Recurring fair value measurement | Level 3    
Fair value of liabilities    
Liabilities 691 976
Sensitivity favourable 20 30
Sensitivity unfavourable (20) (30)
Recurring fair value measurement | Level 3 | Deposits    
Fair value of liabilities    
Liabilities 1 1
Recurring fair value measurement | Level 3 | Debt securities in issue    
Fair value of liabilities    
Liabilities 3  
Recurring fair value measurement | Level 3 | Short Positions.    
Fair value of liabilities    
Liabilities 2  
Recurring fair value measurement | Level 3 | Interest rate    
Fair value of liabilities    
Liabilities 439 678
Sensitivity favourable 10 30
Sensitivity unfavourable (10) (30)
Recurring fair value measurement | Level 3 | Foreign exchange    
Fair value of liabilities    
Liabilities 58 98
Recurring fair value measurement | Level 3 | Other    
Fair value of liabilities    
Liabilities 188 £ 199
Sensitivity favourable 10  
Sensitivity unfavourable £ (10)