Risk management - Schedule of leverage capital and ratios (Details) - EUR (€) € in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Risk Management [Abstract] | |||
| Level 1 Capital | € 94,385 | € 90,170 | € 85,742 |
| Exposure | € 1,924,349 | € 1,885,572 | € 1,826,922 |
| Leverage Ratio | 4.90% | 4.78% | 4.69% |