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Trading derivatives (assets and liabilities) and short positions (Tables) | 12 Months Ended
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Dec. 31, 2025
Trading Derivatives And Short Positions [Abstract] |
Schedule by type of inherent risk of fair value of trading derivatives | The detail, by type of inherent risk, of the fair value of the trading derivatives arranged by the Group is as follows (see note 11):
EUR million
| 2025 | 2024 | 2023
| Debit balance | Credit balance | Debit balance | Credit balance | Debit balance | Credit balance
Interest rate risk | 29,550 |  | 23,728 |  | 30,834 |  | 24,754 |  | 31,480 |  | 26,014 |
Currency risk | 24,755 |  | 20,508 |  | 29,395 |  | 29,110 |  | 22,834 |  | 23,094 |
Price risk | 1,858 |  | 2,279 |  | 1,765 |  | 1,632 |  | 1,279 |  | 904 |
Other risks | 2,192 |  | 5,453 |  | 2,106 |  | 2,257 |  | 735 |  | 577 |
| 58,355 |  | 51,968 |  | 64,100 |  | 57,753 |  | 56,328 |  | 50,589 |
Schedule of short positions | Following is a breakdown of the short positions (liabilities):
EUR million
| 2025 | 2024 | 2023
Borrowed securities |  |  |
Debt instruments | 2,938 |  | 2,566 | 3,263 |
Of which: |  |  |
Banco Santander, S.A. | 1,555 |  | 1,347 | 1,383 |
Banco Santander México, S.A., Institución de Banca Múltiple, Grupo Financiero Santander México | 1,358 |  | 1,199 |  | 1,881 |
Equity instruments | 690 |  | 538 |  | 546 |
Of which: |  |  |
Banco Santander, S.A. | 429 |  | 358 |  | 312 |
Short sales |  |  |
Debt instruments | 40,387 |  | 32,726 |  | 22,365 |
Of which: |  |  |
Banco Santander, S.A. | 28,710 |  | 23,813 |  | 16,143 |
Banco Santander (Brasil) S.A. | 7,417 |  | 5,950 |  | 3,462 |
Santander US Capital Markets LLC | 3,396 |  | 2,382 |  | 2,442 |
| 44,015 |  | 35,830 |  | 26,174 |

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