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Financial instruments: valuation - Level 3 Sensitivities of Liabilities (Details) - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Fair value of liabilities |  |
Specified target level of certainty for assumptions of unobservable inputs | 90.00% |
Recurring fair value measurement |  |
Fair value of liabilities |  |
Liabilities | £ 129,156 | £ 149,577
Recurring fair value measurement | Interest rate |  |
Fair value of liabilities |  |
Liabilities | 38,483 | 48,535
Recurring fair value measurement | Foreign exchange |  |
Fair value of liabilities |  |
Liabilities | 33,586 | 45,237
Recurring fair value measurement | Other |  |
Fair value of liabilities |  |
Liabilities | 326 | 275
Recurring fair value measurement | Level 3 |  |
Fair value of liabilities |  |
Liabilities | 691 | 976
Sensitivity favourable | 20 | 30
Sensitivity unfavourable | (20) | (30)
Recurring fair value measurement | Level 3 | Deposits |  |
Fair value of liabilities |  |
Liabilities | 1 | 1
Recurring fair value measurement | Level 3 | Debt securities in issue |  |
Fair value of liabilities |  |
Liabilities | 3 |
Recurring fair value measurement | Level 3 | Short Positions. |  |
Fair value of liabilities |  |
Liabilities | 2 |
Recurring fair value measurement | Level 3 | Interest rate |  |
Fair value of liabilities |  |
Liabilities | 439 | 678
Sensitivity favourable | 10 | 30
Sensitivity unfavourable | (10) | (30)
Recurring fair value measurement | Level 3 | Foreign exchange |  |
Fair value of liabilities |  |
Liabilities | 58 | 98
Recurring fair value measurement | Level 3 | Other |  |
Fair value of liabilities |  |
Liabilities | 188 | £ 199
Sensitivity favourable | 10 |
Sensitivity unfavourable | £ (10) |

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