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Financial instruments - valuation - Hierarchy of assets (Details) - At fair value - GBP (£) £ in Millions | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Fair value of assets |  |  |  |
Assets | £ 173,504 | £ 165,969 |  |
Trading loans |  |  |  |
Fair value of assets |  |  |  |
Assets | 35,179 | 35,039 |  |
Trading securities |  |  |  |
Fair value of assets |  |  |  |
Assets | 21,527 | 13,878 |  |
Interest rate |  |  |  |
Fair value of assets |  |  |  |
Assets | 35,028 | 37,499 |  |
Foreign exchange |  |  |  |
Fair value of assets |  |  |  |
Assets | 37,898 | 40,797 |  |
Other derivatives |  |  |  |
Fair value of assets |  |  |  |
Assets | 84 | 110 |  |
Other loans |  |  |  |
Fair value of assets |  |  |  |
Assets | 565 | 853 |  |
Other securities |  |  |  |
Fair value of assets |  |  |  |
Assets | 43,223 | 37,793 |  |
Level 1 |  |  |  |
Fair value of assets |  |  |  |
Assets | £ 42,225 | £ 32,715 |  |
As a % of total fair value assets | 24.00% | 20.00% |  |
Level 1 | Trading securities |  |  |  |
Fair value of assets |  |  |  |
Assets | £ 16,289 | £ 8,772 |  |
Level 1 | Other securities |  |  |  |
Fair value of assets |  |  |  |
Assets | 25,936 | 23,943 |  |
Level 2 |  |  |  |
Fair value of assets |  |  |  |
Assets | £ 129,696 | £ 131,572 |  |
As a % of total fair value assets | 75.00% | 79.00% |  |
Level 2 | Trading loans |  |  |  |
Fair value of assets |  |  |  |
Assets | £ 34,936 | £ 34,761 |  |
Level 2 | Trading securities |  |  |  |
Fair value of assets |  |  |  |
Assets | 5,238 | 5,106 |  |
Level 2 | Interest rate |  |  |  |
Fair value of assets |  |  |  |
Assets | 34,582 | 37,026 |  |
Level 2 | Foreign exchange |  |  |  |
Fair value of assets |  |  |  |
Assets | 37,749 | 40,687 |  |
Level 2 | Other derivatives |  |  |  |
Fair value of assets |  |  |  |
Assets | 42 | 63 |  |
Level 2 | Other loans |  |  |  |
Fair value of assets |  |  |  |
Assets | 38 | 288 |  |
Level 2 | Other securities |  |  |  |
Fair value of assets |  |  |  |
Assets | 17,111 | 13,641 |  |
Level 3 |  |  |  |
Fair value of assets |  |  |  |
Assets | £ 1,583 | £ 1,682 | £ 1,656 | £ 1,961
As a % of total fair value assets | 1.00% | 1.00% |  |
Level 3 | Trading loans |  |  |  |
Fair value of assets |  |  |  |
Assets | £ 243 | £ 278 |  |
Level 3 | Interest rate |  |  |  |
Fair value of assets |  |  |  |
Assets | 446 | 473 |  |
Level 3 | Foreign exchange |  |  |  |
Fair value of assets |  |  |  |
Assets | 149 | 110 |  |
Level 3 | Other derivatives |  |  |  |
Fair value of assets |  |  |  |
Assets | 42 | 47 |  |
Level 3 | Other loans |  |  |  |
Fair value of assets |  |  |  |
Assets | 527 | 565 |  |
Level 3 | Other securities |  |  |  |
Fair value of assets |  |  |  |
Assets | £ 176 | £ 209 |  |

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