Credit related Commitments and Contingent Liabilities - Credit Related Commitments and Contingent Liabilities (Detail) - EUR (€) € in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Credit related Commitments and Contingent Liabilities [Abstract] | ||
| Irrevocable lending commitments | € 234,228 | € 217,949 |
| Revocable lending commitments | 51,599 | 56,356 |
| Contingent liabilities | 91,961 | 79,092 |
| Total | € 377,789 | € 353,397 |