Provisions - Narrative (Details) - GBP (£) £ in Millions |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
Sep. 30, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| OTHER PROVISIONS (Details) - Schedule of Assumptions for Other Provisions [Line Items] | |||
| Restructuring provision | £ 170 | £ 135 | |
| Regulatory and legal provisions £m | |||
| OTHER PROVISIONS (Details) - Schedule of Assumptions for Other Provisions [Line Items] | |||
| Change in the year | 968 | ||
| Provisions | 2,276 | 1,600 | |
| Motor Commission Review | |||
| OTHER PROVISIONS (Details) - Schedule of Assumptions for Other Provisions [Line Items] | |||
| Change in the year | £ 800 | ||
| Provisions | 1,950 | ||
| Dilapidations, rent reviews and other property related matters | |||
| OTHER PROVISIONS (Details) - Schedule of Assumptions for Other Provisions [Line Items] | |||
| Provisions | 119 | 154 | |
| Indemnities and other matters relating to legacy business disposals | |||
| OTHER PROVISIONS (Details) - Schedule of Assumptions for Other Provisions [Line Items] | |||
| Provisions | £ 41 | £ 35 |