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Financial instruments: valuation - Hierarchy of assets (Details) - GBP (£) £ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Fair value of assets |  |  |
Assets | £ 202,880 | £ 280,855 |
Trading loans |  |  |
Fair value of assets |  |  |
Assets | 34,203 | 39,775 |
Trading securities |  |  |
Fair value of assets |  |  |
Assets | 24,955 | 29,215 |
Derivatives [Member] |  |  |
Fair value of assets |  |  |
Assets | 106,139 | 166,523 |
Other loans |  |  |
Fair value of assets |  |  |
Assets | 566 | 353 |
Securities |  |  |
Fair value of assets |  |  |
Assets | 37,017 | 44,989 |
Level 1 |  |  |
Fair value of assets |  |  |
Assets | £ 48,443 | £ 57,507 |
As % of Total Fair Value Assets | 24.00% | 20.00% |
Level 1 | Trading securities |  |  |
Fair value of assets |  |  |
Assets | £ 19,563 | £ 21,535 |
Level 1 | Securities |  |  |
Fair value of assets |  |  |
Assets | 28,880 | 35,972 |
Level 2 |  |  |
Fair value of assets |  |  |
Assets | £ 152,385 | £ 221,625 |
As % of Total Fair Value Assets | 75.00% | 79.00% |
Level 2 | Trading loans |  |  |
Fair value of assets |  |  |
Assets | £ 33,482 | £ 39,550 |
Level 2 | Trading securities |  |  |
Fair value of assets |  |  |
Assets | 5,371 | 7,599 |
Level 2 | Derivatives [Member] |  |  |
Fair value of assets |  |  |
Assets | 105,222 | 165,441 |
Level 2 | Other loans |  |  |
Fair value of assets |  |  |
Assets | 359 | 185 |
Level 2 | Securities |  |  |
Fair value of assets |  |  |
Assets | 7,951 | 8,850 |
Level 3 |  |  |
Fair value of assets |  |  |
Assets | £ 2,052 | £ 1,723 |
As % of Total Fair Value Assets | 1.00% | 1.00% |
Level 3 | Trading loans |  |  |
Fair value of assets |  |  |
Assets | £ 721 | £ 225 |
Level 3 | Trading securities |  |  |
Fair value of assets |  |  |
Assets | 21 | 81 |
Level 3 | Derivatives [Member] |  |  |
Fair value of assets |  |  |
Assets | 917 | 1,082 |
Level 3 | Other loans |  |  |
Fair value of assets |  |  |
Assets | 207 | 168 |
Level 3 | Securities |  |  |
Fair value of assets |  |  |
Assets | 186 | 167 |
Recurring | Level 3 |  |  |
Fair value of assets |  |  |
Assets | £ 2,052 | £ 1,723 | £ 2,554

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