Risk management - Schedule of regulatory capital phase-in coefficients (Details) - EUR (€) € in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|
| Risk Management [Abstract] | |||
| Level 1 ordinary eligible capital (EUR million) | € 84,739 | € 79,800 | € 76,741 |
| Level 1 additional eligible capital (EUR million) | 9,645 | 10,371 | 9,002 |
| Level 2 eligible capital (EUR million) | 17,460 | 18,418 | 16,497 |
| Risk-weighted assets (EUR million) | € 629,430 | € 624,503 | € 623,731 |
| Level 1 ordinary capital coefficient (CET 1) | 13.46% | 12.78% | 12.30% |
| Level 1 additional capital coefficient (AT1) | 1.53% | 1.66% | 1.45% |
| Level 1 capital coefficient (TIER1) | 15.00% | 14.44% | 13.75% |
| Level 2 capital coefficient (TIER 2) | 2.77% | 2.95% | 2.64% |
| Total capital coefficient | 17.77% | 17.39% | 16.39% |