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Financial instruments: valuation - Level 3 Sensitivities of Assets (Details) - At fair value - GBP (£) £ in Millions | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
Fair value of assets |  |  |  |
Financial Assets, at fair value | £ 142,163 | £ 153,862 |  |
Trading loans |  |  |  |
Fair value of assets |  |  |  |
Financial Assets, at fair value | 26,238 | 33,597 |  |
Trading securities |  |  |  |
Fair value of assets |  |  |  |
Financial Assets, at fair value | 19,736 | 11,954 |  |
Interest rate |  |  |  |
Fair value of assets |  |  |  |
Financial Assets, at fair value | 40,925 | 44,563 |  |
Foreign exchange |  |  |  |
Fair value of assets |  |  |  |
Financial Assets, at fair value | 26,446 | 34,161 |  |
Other derivatives |  |  |  |
Fair value of assets |  |  |  |
Financial Assets, at fair value | 143 | 180 |  |
Other loans |  |  |  |
Fair value of assets |  |  |  |
Financial Assets, at fair value | 768 | 765 |  |
Other securities |  |  |  |
Fair value of assets |  |  |  |
Financial Assets, at fair value | 27,907 | 28,642 |  |
Level 3 |  |  |  |
Fair value of assets |  |  |  |
Financial Assets, at fair value | 1,656 | 1,961 | £ 2,105 | £ 2,333
Sensitivity favourable | 50 | 50 |  |
Sensitivity unfavourable | (80) | 120 |  |
Level 3 | Trading loans |  |  |  |
Fair value of assets |  |  |  |
Financial Assets, at fair value | 230 | 209 |  |
Level 3 | Trading securities |  |  |  |
Fair value of assets |  |  |  |
Financial Assets, at fair value |  | 14 |  |
Level 3 | Derivatives |  |  |  |
Fair value of assets |  |  |  |
Financial Assets, at fair value | 762 | 823 | £ 930 | £ 1,007
Level 3 | Interest rate |  |  |  |
Fair value of assets |  |  |  |
Financial Assets, at fair value | 561 | 650 |  |
Sensitivity favourable | 20 | 20 |  |
Sensitivity unfavourable | (20) | (20) |  |
Level 3 | Foreign exchange |  |  |  |
Fair value of assets |  |  |  |
Financial Assets, at fair value | 132 | 65 |  |
Sensitivity favourable | 10 |  |  |
Sensitivity unfavourable | (10) |  |  |
Level 3 | Other derivatives |  |  |  |
Fair value of assets |  |  |  |
Financial Assets, at fair value | 69 | 108 |  |
Sensitivity favourable |  | 10 |  |
Sensitivity unfavourable |  | (10) |  |
Level 3 | Other loans |  |  |  |
Fair value of assets |  |  |  |
Financial Assets, at fair value | 416 | 657 |  |
Sensitivity unfavourable | (10) | 40 |  |
Level 3 | Other securities |  |  |  |
Fair value of assets |  |  |  |
Financial Assets, at fair value | 248 | 258 |  |
Sensitivity favourable | 20 | 20 |  |
Sensitivity unfavourable | £ (40) | £ 50 |  |

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