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Financial instruments - valuation - Hierarchy of liabilities (Details) - At fair value - GBP (£) £ in Millions | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Fair value of liabilities |  |  |  |
Liabilities | £ 128,989 | £ 130,578 |  |
Trading deposits |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 46,379 | 43,966 |  |
Debt securities in issue, trading |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 251 | 257 |  |
Short positions, trading |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 12,215 | 10,491 |  |
Interest rate |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 28,317 | 31,532 |  |
Foreign exchange |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 37,496 | 40,306 |  |
Other derivatives |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 170 | 244 |  |
Debt securities in issue |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 1,945 | 1,736 |  |
Other deposits |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 1,982 | 1,812 |  |
Financial liabilities, subordinated |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 234 | 234 |  |
Level 1 |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | £ 9,749 | £ 8,766 |  |
As a % of total value liabilities | 8.00% | 7.00% |  |
Level 1 | Short positions, trading |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | £ 9,749 | £ 8,766 |  |
Level 2 |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | £ 118,842 | £ 121,318 |  |
As a % of total value liabilities | 92.00% | 93.00% |  |
Level 2 | Trading deposits |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | £ 46,379 | £ 43,966 |  |
Level 2 | Debt securities in issue, trading |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 251 | 257 |  |
Level 2 | Short positions, trading |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 2,465 | 1,724 |  |
Level 2 | Interest rate |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 28,114 | 31,253 |  |
Level 2 | Foreign exchange |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 37,420 | 40,240 |  |
Level 2 | Other derivatives |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 107 | 124 |  |
Level 2 | Debt securities in issue |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 1,942 | 1,733 |  |
Level 2 | Other deposits |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 1,930 | 1,787 |  |
Level 2 | Financial liabilities, subordinated |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 234 | 234 |  |
Level 3 |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | £ 398 | £ 494 | £ 686 | £ 691
As a % of total value liabilities | 0.00% | 0.00% |  |
Level 3 | Short positions, trading |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | £ 1 | £ 1 |  |
Level 3 | Interest rate |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 203 | 279 |  |
Level 3 | Foreign exchange |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 76 | 66 |  |
Level 3 | Other derivatives |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 63 | 120 |  |
Level 3 | Debt securities in issue |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | 3 | 3 |  |
Level 3 | Other deposits |  |  |  |
Fair value of liabilities |  |  |  |
Liabilities | £ 52 | £ 25 |  |

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