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Financial instruments: valuation - Level 3 Sensitivities of Assets (Details) - Recurring fair value measurement - GBP (£) £ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fair value of assets |  |  |
Financial Assets, at fair value | £ 153,862 | £ 162,882 |
Trading securities |  |  |
Fair value of assets |  |  |
Financial Assets, at fair value | 11,954 | 9,922 |
Interest rate |  |  |
Fair value of assets |  |  |
Financial Assets, at fair value | 44,563 | 53,480 |
Foreign exchange |  |  |
Fair value of assets |  |  |
Financial Assets, at fair value | 34,161 | 45,829 |
Other |  |  |
Fair value of assets |  |  |
Financial Assets, at fair value | 180 | 236 |
Other loans |  |  |
Fair value of assets |  |  |
Financial Assets, at fair value | 765 | 899 |
Other securities |  |  |
Fair value of assets |  |  |
Financial Assets, at fair value | 28,642 | 16,861 |
Level 3 |  |  |
Fair value of assets |  |  |
Financial Assets, at fair value | 1,961 | 2,333 | £ 2,052
Sensitivity favourable | 50 | 80 |
Sensitivity unfavourable | (120) | (100) |
Level 3 | Loans |  |  |
Fair value of assets |  |  |
Financial Assets, at fair value | 209 | 395 |
Sensitivity favourable |  | 10 |
Sensitivity unfavourable |  | (10) |
Level 3 | Trading securities |  |  |
Fair value of assets |  |  |
Financial Assets, at fair value | 14 | 1 |
Level 3 | Interest rate |  |  |
Fair value of assets |  |  |
Financial Assets, at fair value | 650 | 711 |
Sensitivity favourable | 20 | 30 |
Sensitivity unfavourable | (20) | (30) |
Level 3 | Foreign exchange |  |  |
Fair value of assets |  |  |
Financial Assets, at fair value | 65 | 114 |
Sensitivity favourable |  | 10 |
Sensitivity unfavourable |  | (10) |
Level 3 | Other |  |  |
Fair value of assets |  |  |
Financial Assets, at fair value | 108 | 182 |
Sensitivity favourable | 10 | 10 |
Sensitivity unfavourable | (10) | (10) |
Level 3 | Other loans |  |  |
Fair value of assets |  |  |
Financial Assets, at fair value | 657 | 727 |
Sensitivity unfavourable | (40) | (10) |
Level 3 | Other securities |  |  |
Fair value of assets |  |  |
Financial Assets, at fair value | 258 | 203 |
Sensitivity favourable | 20 | 20 |
Sensitivity unfavourable | £ (50) | £ (30) |

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