General and Administrative Expenses (Detail) - EUR (€) € in Millions |
12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
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| General and administrative expenses [Abstract] | |||||||
| Information Technology | € 3,504 | € 3,610 | € 3,755 | ||||
| Occupancy, furniture and equipment expenses | 1,463 | 1,624 | 1,478 | ||||
| Regulatory, Tax and Insurance | [1] | 862 | 1,028 | 1,399 | |||
| Professional services | 671 | 763 | 899 | ||||
| Banking Services and outsourced operations | 891 | 964 | 964 | ||||
| Market Data and Research Services | 410 | 400 | 374 | ||||
| Travel expenses | 152 | 153 | 143 | ||||
| Marketing expenses | 195 | 149 | 203 | ||||
| Other expenses | [2] | 710 | 2,552 | 899 | |||
| Total general and administrative expenses | € 8,860 | € 11,243 | € 10,112 | ||||
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