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Financial instruments: valuation - Hierarchy of assets (Details) - Recurring fair value measurement - GBP (£) £ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Fair value of assets |  |  |
Assets | £ 153,862 | £ 162,882 |
Trading loans |  |  |
Fair value of assets |  |  |
Assets | 33,597 | 35,655 |
Trading securities |  |  |
Fair value of assets |  |  |
Assets | 11,954 | 9,922 |
Interest rate |  |  |
Fair value of assets |  |  |
Assets | 44,563 | 53,480 |
Foreign exchange |  |  |
Fair value of assets |  |  |
Assets | 34,161 | 45,829 |
Other |  |  |
Fair value of assets |  |  |
Assets | 180 | 236 |
Other loans |  |  |
Fair value of assets |  |  |
Assets | 765 | 899 |
Other securities |  |  |
Fair value of assets |  |  |
Assets | 28,642 | 16,861 |
Level 1 |  |  |
Fair value of assets |  |  |
Assets | £ 26,296 | £ 17,848 |
As a % of total value assets | 17.00% | 11.00% |
Level 1 | Trading securities |  |  |
Fair value of assets |  |  |
Assets | £ 8,447 | £ 7,463 |
Level 1 | Interest rate |  |  |
Fair value of assets |  |  |
Assets | 1 | 5 |
Level 1 | Other securities |  |  |
Fair value of assets |  |  |
Assets | 17,848 | 10,380 |
Level 2 |  |  |
Fair value of assets |  |  |
Assets | £ 125,605 | £ 142,701 |
As a % of total value assets | 82.00% | 88.00% |
Level 2 | Trading loans |  |  |
Fair value of assets |  |  |
Assets | £ 33,388 | £ 35,260 |
Level 2 | Trading securities |  |  |
Fair value of assets |  |  |
Assets | 3,493 | 2,458 |
Level 2 | Interest rate |  |  |
Fair value of assets |  |  |
Assets | 43,912 | 52,764 |
Level 2 | Foreign exchange |  |  |
Fair value of assets |  |  |
Assets | 34,096 | 45,715 |
Level 2 | Other |  |  |
Fair value of assets |  |  |
Assets | 72 | 54 |
Level 2 | Other loans |  |  |
Fair value of assets |  |  |
Assets | 108 | 172 |
Level 2 | Other securities |  |  |
Fair value of assets |  |  |
Assets | 10,536 | 6,278 |
Level 3 |  |  |
Fair value of assets |  |  |
Assets | £ 1,961 | £ 2,333 | £ 2,052
As a % of total value assets | 1.00% | 1.00% |
Level 3 | Trading loans |  |  |
Fair value of assets |  |  |
Assets | £ 209 | £ 395 |
Level 3 | Trading securities |  |  |
Fair value of assets |  |  |
Assets | 14 | 1 |
Level 3 | Interest rate |  |  |
Fair value of assets |  |  |
Assets | 650 | 711 |
Level 3 | Foreign exchange |  |  |
Fair value of assets |  |  |
Assets | 65 | 114 |
Level 3 | Other |  |  |
Fair value of assets |  |  |
Assets | 108 | 182 |
Level 3 | Other loans |  |  |
Fair value of assets |  |  |
Assets | 657 | 727 |
Level 3 | Other securities |  |  |
Fair value of assets |  |  |
Assets | £ 258 | £ 203 |

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