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Financial instruments - valuation - Hierarchy of assets (Details) - Recurring fair value measurement - GBP (£) £ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Fair value of assets |  |  |
Assets | £ 165,969 | £ 153,862 |
Trading loans |  |  |
Fair value of assets |  |  |
Assets | 35,039 | 33,597 |
Trading securities |  |  |
Fair value of assets |  |  |
Assets | 13,878 | 11,954 |
Interest rate |  |  |
Fair value of assets |  |  |
Assets | 37,499 | 44,563 |
Foreign exchange |  |  |
Fair value of assets |  |  |
Assets | 40,797 | 34,161 |
Other derivatives |  |  |
Fair value of assets |  |  |
Assets | 110 | 180 |
Other loans |  |  |
Fair value of assets |  |  |
Assets | 853 | 765 |
Other securities |  |  |
Fair value of assets |  |  |
Assets | 37,793 | 28,642 |
Level 1 |  |  |
Fair value of assets |  |  |
Assets | £ 32,715 | £ 26,296 |
As a % of total fair value assets | 20.00% | 17.00% |
Level 1 | Trading securities |  |  |
Fair value of assets |  |  |
Assets | £ 8,772 | £ 8,447 |
Level 1 | Interest rate |  |  |
Fair value of assets |  |  |
Assets |  | 1 |
Level 1 | Other securities |  |  |
Fair value of assets |  |  |
Assets | 23,943 | 17,848 |
Level 2 |  |  |
Fair value of assets |  |  |
Assets | £ 131,572 | £ 125,605 |
As a % of total fair value assets | 79.00% | 82.00% |
Level 2 | Trading loans |  |  |
Fair value of assets |  |  |
Assets | £ 34,761 | £ 33,388 |
Level 2 | Trading securities |  |  |
Fair value of assets |  |  |
Assets | 5,106 | 3,493 |
Level 2 | Interest rate |  |  |
Fair value of assets |  |  |
Assets | 37,026 | 43,912 |
Level 2 | Foreign exchange |  |  |
Fair value of assets |  |  |
Assets | 40,687 | 34,096 |
Level 2 | Other derivatives |  |  |
Fair value of assets |  |  |
Assets | 63 | 72 |
Level 2 | Other loans |  |  |
Fair value of assets |  |  |
Assets | 288 | 108 |
Level 2 | Other securities |  |  |
Fair value of assets |  |  |
Assets | 13,641 | 10,536 |
Level 3 |  |  |
Fair value of assets |  |  |
Assets | £ 1,682 | £ 1,961 | £ 2,333
As a % of total fair value assets | 1.00% | 1.00% |
Level 3 | Trading loans |  |  |
Fair value of assets |  |  |
Assets | £ 278 | £ 209 |
Level 3 | Trading securities |  |  |
Fair value of assets |  |  |
Assets |  | 14 |
Level 3 | Interest rate |  |  |
Fair value of assets |  |  |
Assets | 473 | 650 |
Level 3 | Foreign exchange |  |  |
Fair value of assets |  |  |
Assets | 110 | 65 |
Level 3 | Other derivatives |  |  |
Fair value of assets |  |  |
Assets | 47 | 108 |
Level 3 | Other loans |  |  |
Fair value of assets |  |  |
Assets | 565 | 657 |
Level 3 | Other securities |  |  |
Fair value of assets |  |  |
Assets | £ 209 | £ 258 |

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