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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Fair value of assets |  |  |
Financial assets, at fair value | £ 165,969 | £ 153,862 |
Trading loans |  |  |
Fair value of assets |  |  |
Financial assets, at fair value | 35,039 | 33,597 |
Trading securities |  |  |
Fair value of assets |  |  |
Financial assets, at fair value | 13,878 | 11,954 |
Interest rate |  |  |
Fair value of assets |  |  |
Financial assets, at fair value | 37,499 | 44,563 |
Foreign exchange |  |  |
Fair value of assets |  |  |
Financial assets, at fair value | 40,797 | 34,161 |
Other derivatives |  |  |
Fair value of assets |  |  |
Financial assets, at fair value | 110 | 180 |
Other loans |  |  |
Fair value of assets |  |  |
Financial assets, at fair value | 853 | 765 |
Other securities |  |  |
Fair value of assets |  |  |
Financial assets, at fair value | 37,793 | 28,642 |
Level 3 |  |  |
Fair value of assets |  |  |
Financial assets, at fair value | 1,682 | 1,961 | £ 2,333
Sensitivity favourable | 40 | 50 |
Sensitivity unfavourable | (60) | (120) |
Level 3 | Trading loans |  |  |
Fair value of assets |  |  |
Financial assets, at fair value | 278 | 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 | 630 | 823 | £ 1,007
Level 3 | Interest rate |  |  |
Fair value of assets |  |  |
Financial assets, at fair value | 473 | 650 |
Sensitivity favourable | 20 | 20 |
Sensitivity unfavourable | (20) | (20) |
Level 3 | Foreign exchange |  |  |
Fair value of assets |  |  |
Financial assets, at fair value | 110 | 65 |
Level 3 | Other derivatives |  |  |
Fair value of assets |  |  |
Financial assets, at fair value | 47 | 108 |
Sensitivity favourable |  | 10 |
Sensitivity unfavourable |  | (10) |
Level 3 | Other loans |  |  |
Fair value of assets |  |  |
Financial assets, at fair value | 565 | 657 |
Sensitivity unfavourable | (10) | (40) |
Level 3 | Other securities |  |  |
Fair value of assets |  |  |
Financial assets, at fair value | 209 | 258 |
Sensitivity favourable | 20 | 20 |
Sensitivity unfavourable | £ (30) | £ (50) |

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