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Financial instruments: valuation - Hierarchy of assets (Details) - At fair value - GBP (£) £ in Millions | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Fair value of assets |  |  |  |
Assets | £ 142,163 | £ 153,862 |  |
Trading loans |  |  |  |
Fair value of assets |  |  |  |
Assets | 26,238 | 33,597 |  |
Trading securities |  |  |  |
Fair value of assets |  |  |  |
Assets | 19,736 | 11,954 |  |
Interest rate |  |  |  |
Fair value of assets |  |  |  |
Assets | 40,925 | 44,563 |  |
Foreign exchange |  |  |  |
Fair value of assets |  |  |  |
Assets | 26,446 | 34,161 |  |
Other derivatives |  |  |  |
Fair value of assets |  |  |  |
Assets | 143 | 180 |  |
Other loans |  |  |  |
Fair value of assets |  |  |  |
Assets | 768 | 765 |  |
Other securities |  |  |  |
Fair value of assets |  |  |  |
Assets | 27,907 | 28,642 |  |
Level 1 |  |  |  |
Fair value of assets |  |  |  |
Assets | £ 33,066 | £ 26,296 |  |
As a % of total fair value assets | 23.00% | 17.00% |  |
Level 1 | Trading securities |  |  |  |
Fair value of assets |  |  |  |
Assets | £ 15,097 | £ 8,447 |  |
Level 1 | Interest rate |  |  |  |
Fair value of assets |  |  |  |
Assets |  | 1 |  |
Level 1 | Other securities |  |  |  |
Fair value of assets |  |  |  |
Assets | 17,969 | 17,848 |  |
Level 2 |  |  |  |
Fair value of assets |  |  |  |
Assets | £ 107,441 | £ 125,605 |  |
As a % of total fair value assets | 76.00% | 82.00% |  |
Level 2 | Trading loans |  |  |  |
Fair value of assets |  |  |  |
Assets | £ 26,008 | £ 33,388 |  |
Level 2 | Trading securities |  |  |  |
Fair value of assets |  |  |  |
Assets | 4,639 | 3,493 |  |
Level 2 | Interest rate |  |  |  |
Fair value of assets |  |  |  |
Assets | 40,364 | 43,912 |  |
Level 2 | Foreign exchange |  |  |  |
Fair value of assets |  |  |  |
Assets | 26,314 | 34,096 |  |
Level 2 | Other derivatives |  |  |  |
Fair value of assets |  |  |  |
Assets | 74 | 72 |  |
Level 2 | Other loans |  |  |  |
Fair value of assets |  |  |  |
Assets | 352 | 108 |  |
Level 2 | Other securities |  |  |  |
Fair value of assets |  |  |  |
Assets | 9,690 | 10,536 |  |
Level 3 |  |  |  |
Fair value of assets |  |  |  |
Assets | £ 1,656 | £ 1,961 | £ 2,105 | £ 2,333
As a % of total fair value assets | 1.00% | 1.00% |  |
Level 3 | Trading loans |  |  |  |
Fair value of assets |  |  |  |
Assets | £ 230 | £ 209 |  |
Level 3 | Trading securities |  |  |  |
Fair value of assets |  |  |  |
Assets |  | 14 |  |
Level 3 | Interest rate |  |  |  |
Fair value of assets |  |  |  |
Assets | 561 | 650 |  |
Level 3 | Foreign exchange |  |  |  |
Fair value of assets |  |  |  |
Assets | 132 | 65 |  |
Level 3 | Other derivatives |  |  |  |
Fair value of assets |  |  |  |
Assets | 69 | 108 |  |
Level 3 | Other loans |  |  |  |
Fair value of assets |  |  |  |
Assets | 416 | 657 |  |
Level 3 | Other securities |  |  |  |
Fair value of assets |  |  |  |
Assets | £ 248 | £ 258 |  |

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