Other operating expenses - Summary of other operating expenses (Details) - EUR (€) € in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Expenses by nature [abstract] | |||
| Promotional and clients acquisition costs | € 443 | € 441 | € 369 |
| IT related expenses (excluding outsourcing and subcontracting) | 768 | 694 | 653 |
| Outsourcing and subcontracting | 697 | 664 | 579 |
| Facilities | 271 | 277 | 289 |
| Market data services | 153 | 136 | 120 |
| Advisory fees | 298 | 321 | 299 |
| Audit and supervisory fees | 142 | 142 | 123 |
| Indirect taxes | 208 | 235 | 107 |
| Regulatory costs | 866 | 882 | 1,042 |
| Depreciation and impairment of property and equipment 9 | 451 | 475 | 493 |
| Amortisation and impairment of intangible assets 10 | 230 | 228 | 218 |
| Additions and releases of provisions 15 | 322 | 219 | 243 |
| Other | 134 | 223 | 303 |
| Other operating expense | € 4,984 | € 4,937 | € 4,839 |