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Financial instruments: valuation - Level 3 Sensitivities of Liabilities (Details) - GBP (£) £ in Millions | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
Fair value of liabilities |  |  |  |
Specified target level of certainty for assumptions of unobservable inputs | 90.00% |  |  |
At fair value |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | £ 118,533 | £ 129,156 |  |
At fair value | Trading deposits |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 44,151 | 43,127 |  |
At fair value | Short positions, trading |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 9,709 | 9,803 |  |
At fair value | Interest rate |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 35,138 | 38,483 |  |
At fair value | Foreign exchange |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 25,441 | 33,586 |  |
At fair value | Other derivatives |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 270 | 326 |  |
At fair value | Debt securities in issue |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 1,639 | 1,608 |  |
At fair value | Other deposits |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 1,649 | 1,280 |  |
At fair value | Level 3 |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 686 | 691 | £ 897 | £ 976
Sensitivity favourable | 20 | 20 |  |
Sensitivity unfavourable | (40) | 20 |  |
At fair value | Level 3 | Trading deposits |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities |  | 1 |  |
At fair value | Level 3 | Short positions, trading |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 2 | 2 |  |
At fair value | Level 3 | Derivatives |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 658 | 685 | £ 895 | £ 975
At fair value | Level 3 | Interest rate |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 440 | 439 |  |
Sensitivity favourable | 10 | 10 |  |
Sensitivity unfavourable | (10) | (10) |  |
At fair value | Level 3 | Foreign exchange |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 67 | 58 |  |
At fair value | Level 3 | Other derivatives |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 151 | 188 |  |
Sensitivity favourable | 10 | 10 |  |
Sensitivity unfavourable | (10) | (10) |  |
At fair value | Level 3 | Debt securities in issue |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 3 | £ 3 |  |
At fair value | Level 3 | Other deposits |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 23 |  |  |
Sensitivity unfavourable | £ (20) |  |  |

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