Accounting policies - Schedule of depreciation rates of tangible assets (Details) |
12 Months Ended |
|---|---|
Dec. 31, 2025 | |
| Buildings for own use | |
| Disclosure of detailed information about property, plant and equipment [line items] | |
| Depreciation rate, property, plant and equipment | 2.40% |
| Furniture | |
| Disclosure of detailed information about property, plant and equipment [line items] | |
| Depreciation rate, property, plant and equipment | 9.50% |
| Fixtures | |
| Disclosure of detailed information about property, plant and equipment [line items] | |
| Depreciation rate, property, plant and equipment | 9.50% |
| Office and IT equipment | |
| Disclosure of detailed information about property, plant and equipment [line items] | |
| Depreciation rate, property, plant and equipment | 23.60% |