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Financial instruments - valuation - Hierarchy of liabilities (Details) - Recurring fair value measurement - GBP (£) £ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Fair value of liabilities |  |  |
Liabilities | £ 130,578 | £ 129,156 |
Trading deposits |  |  |
Fair value of liabilities |  |  |
Liabilities | 43,966 | 43,127 |
Debt securities in issue, trading |  |  |
Fair value of liabilities |  |  |
Liabilities | 257 | 706 |
Short positions, trading |  |  |
Fair value of liabilities |  |  |
Liabilities | 10,491 | 9,803 |
Interest rate |  |  |
Fair value of liabilities |  |  |
Liabilities | 31,532 | 38,483 |
Foreign exchange |  |  |
Fair value of liabilities |  |  |
Liabilities | 40,306 | 33,586 |
Other derivatives |  |  |
Fair value of liabilities |  |  |
Liabilities | 244 | 326 |
Debt securities in issue |  |  |
Fair value of liabilities |  |  |
Liabilities | 1,736 | 1,608 |
Other deposits |  |  |
Fair value of liabilities |  |  |
Liabilities | 1,812 | 1,280 |
Financial liabilities, subordinated |  |  |
Fair value of liabilities |  |  |
Liabilities | 234 | 237 |
Level 1 |  |  |
Fair value of liabilities |  |  |
Liabilities | £ 8,766 | £ 7,936 |
As a % of total value liabilities | 7.00% | 6.00% |
Level 1 | Short positions, trading |  |  |
Fair value of liabilities |  |  |
Liabilities | £ 8,766 | £ 7,936 |
Level 2 |  |  |
Fair value of liabilities |  |  |
Liabilities | £ 121,318 | £ 120,529 |
As a % of total value liabilities | 93.00% | 93.00% |
Level 2 | Trading deposits |  |  |
Fair value of liabilities |  |  |
Liabilities | £ 43,966 | £ 43,126 |
Level 2 | Debt securities in issue, trading |  |  |
Fair value of liabilities |  |  |
Liabilities | 257 | 706 |
Level 2 | Short positions, trading |  |  |
Fair value of liabilities |  |  |
Liabilities | 1,724 | 1,865 |
Level 2 | Interest rate |  |  |
Fair value of liabilities |  |  |
Liabilities | 31,253 | 38,044 |
Level 2 | Foreign exchange |  |  |
Fair value of liabilities |  |  |
Liabilities | 40,240 | 33,528 |
Level 2 | Other derivatives |  |  |
Fair value of liabilities |  |  |
Liabilities | 124 | 138 |
Level 2 | Debt securities in issue |  |  |
Fair value of liabilities |  |  |
Liabilities | 1,733 | 1,605 |
Level 2 | Other deposits |  |  |
Fair value of liabilities |  |  |
Liabilities | 1,787 | 1,280 |
Level 2 | Financial liabilities, subordinated |  |  |
Fair value of liabilities |  |  |
Liabilities | 234 | 237 |
Level 3 |  |  |
Fair value of liabilities |  |  |
Liabilities | £ 494 | £ 691 | £ 976
As a % of total value liabilities | 0.00% | 1.00% |
Level 3 | Trading deposits |  |  |
Fair value of liabilities |  |  |
Liabilities |  | £ 1 |
Level 3 | Short positions, trading |  |  |
Fair value of liabilities |  |  |
Liabilities | £ 1 | 2 |
Level 3 | Interest rate |  |  |
Fair value of liabilities |  |  |
Liabilities | 279 | 439 |
Level 3 | Foreign exchange |  |  |
Fair value of liabilities |  |  |
Liabilities | 66 | 58 |
Level 3 | Other derivatives |  |  |
Fair value of liabilities |  |  |
Liabilities | 120 | 188 |
Level 3 | Debt securities in issue |  |  |
Fair value of liabilities |  |  |
Liabilities | 3 | £ 3 |
Level 3 | Other deposits |  |  |
Fair value of liabilities |  |  |
Liabilities | £ 25 |  |

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