Introduction, basis of presentation of the interim condensed consolidated financial statements and other information - Events after the reporting period (Details) - EUR (€) |
Jul. 02, 2025 |
Jul. 01, 2025 |
Jun. 30, 2025 |
Jan. 14, 2020 |
|---|---|---|---|---|
| Preferred securities | Banco Santander, S.A., January 2020 | ||||
| Disclosure of financial liabilities [line items] | ||||
| Notional amount | € 1,500,000,000 | |||
| Interest rate | 4.375% | 4.375% | ||
| Preferred securities | Repaid by Banco Santander S.A. in July 2025 | Repurchase of preferred securities | ||||
| Disclosure of financial liabilities [line items] | ||||
| Notional amount | € 466,600,000 | |||
| Contingently convertible preferred securities | Issued by Banco Santander S.A. in July 2025 | Issue of contingently convertible preferred securities | ||||
| Disclosure of financial liabilities [line items] | ||||
| Notional amount | € 1,500,000,000 |