Structured entities - Carrying amount of interest held in unconsolidated structured entities (Details) - GBP (£) £ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Collective investment vehicles and limited partnerships | ||
| STRUCTURED ENTITIES (Details) - Narrative [Line Items] | ||
| Maximum exposure to loss from interests in structured entities | £ 45,991 | £ 86,630 |
| Securitisation vehicles | ||
| STRUCTURED ENTITIES (Details) - Narrative [Line Items] | ||
| Maximum exposure to loss from interests in structured entities | 1,186 | 2,403 |
| Interest rate derivatives provided to securitisation vehicles | ||
| STRUCTURED ENTITIES (Details) - Narrative [Line Items] | ||
| Maximum exposure to loss from interests in structured entities | £ 5 | £ 22 |