Assets pledged, collateral received and assets transferred - Disclosure of carrying amount of the assets pledged as security against liabilities (Details) - GBP (£) £ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of offsetting of financial liabilities [line items] | ||
| Assets pledged | £ 233,617 | £ 247,018 |
| Cash collateral | ||
| Disclosure of offsetting of financial liabilities [line items] | ||
| Assets pledged | 75,695 | 72,415 |
| Loans and advances at amortised cost | ||
| Disclosure of offsetting of financial liabilities [line items] | ||
| Assets pledged | 22,398 | 41,205 |
| Trading portfolio assets | ||
| Disclosure of offsetting of financial liabilities [line items] | ||
| Assets pledged | 114,852 | 107,249 |
| Financial assets at fair value through the income statement | ||
| Disclosure of offsetting of financial liabilities [line items] | ||
| Assets pledged | 5,653 | 5,729 |
| Financial assets at fair value through other comprehensive income | ||
| Disclosure of offsetting of financial liabilities [line items] | ||
| Assets pledged | £ 15,019 | £ 20,420 |