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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, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Fair value of assets |  |  |  |
Financial assets, at fair value | £ 173,504 | £ 165,969 |  |
Trading loans |  |  |  |
Fair value of assets |  |  |  |
Financial assets, at fair value | 35,179 | 35,039 |  |
Trading securities |  |  |  |
Fair value of assets |  |  |  |
Financial assets, at fair value | 21,527 | 13,878 |  |
Interest rate |  |  |  |
Fair value of assets |  |  |  |
Financial assets, at fair value | 35,028 | 37,499 |  |
Foreign exchange |  |  |  |
Fair value of assets |  |  |  |
Financial assets, at fair value | 37,898 | 40,797 |  |
Other derivatives |  |  |  |
Fair value of assets |  |  |  |
Financial assets, at fair value | 84 | 110 |  |
Other loans |  |  |  |
Fair value of assets |  |  |  |
Financial assets, at fair value | 565 | 853 |  |
Other securities |  |  |  |
Fair value of assets |  |  |  |
Financial assets, at fair value | 43,223 | 37,793 |  |
Level 3 |  |  |  |
Fair value of assets |  |  |  |
Financial assets, at fair value | 1,583 | 1,682 | £ 1,656 | £ 1,961
Sensitivity favourable | 60 | 40 |  |
Sensitivity unfavourable | (60) | (60) |  |
Level 3 | Trading loans |  |  |  |
Fair value of assets |  |  |  |
Financial assets, at fair value | 243 | 278 |  |
Level 3 | Derivatives |  |  |  |
Fair value of assets |  |  |  |
Financial assets, at fair value | 637 | 630 | £ 762 | £ 823
Level 3 | Interest rate |  |  |  |
Fair value of assets |  |  |  |
Financial assets, at fair value | 446 | 473 |  |
Sensitivity favourable | 20 | 20 |  |
Sensitivity unfavourable | (20) | (20) |  |
Level 3 | Foreign exchange |  |  |  |
Fair value of assets |  |  |  |
Financial assets, at fair value | 149 | 110 |  |
Sensitivity favourable | 10 |  |  |
Sensitivity unfavourable | (10) |  |  |
Level 3 | Other derivatives |  |  |  |
Fair value of assets |  |  |  |
Financial assets, at fair value | 42 | 47 |  |
Level 3 | Other loans |  |  |  |
Fair value of assets |  |  |  |
Financial assets, at fair value | 527 | 565 |  |
Sensitivity favourable | 10 |  |  |
Sensitivity unfavourable | (10) | (10) |  |
Level 3 | Other securities |  |  |  |
Fair value of assets |  |  |  |
Financial assets, at fair value | 176 | 209 |  |
Sensitivity favourable | 20 | 20 |  |
Sensitivity unfavourable | £ (20) | £ (30) |  |

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