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Accumulated retained earnings (Tables) | 12 Months Ended
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Dec. 31, 2025
Retained earnings [abstract] |
Schedule of accumulated retained earnings and reserves of entities accounted for using the equity method | The detail of Accumulated retained earnings and Reserves of entities accounted for using the equity method is as follows:
EUR million
| 2025 | 2024 | 2023
Restricted reserves | 3,328 |  | 3,084 |  | 2,899 |
Legal reserve A | 1,469 |  | 1,515 |  | 1,618 |
Own shares | 480 |  | 421 |  | 649 |
Revaluation reserve Royal Decree-Law 7/1996 | 43 |  | 43 |  | 43 |
Reserve for retired capital | 1,336 |  | 1,105 |  | 589 |
Unrestricted reserves | 31,519 |  | 24,186 |  | 16,033 |
Voluntary reserves B | 26,357 |  | 20,362 |  | 14,284 |
Consolidation reserves attributable to the Bank | 5,162 |  | 3,824 |  | 1,749 |
Reserves of subsidiaries | 47,937 |  | 47,249 |  | 47,669 |
Reserves of entities accounted for using the equity method | 1,643 |  | 1,831 |  | 1,762 |
| 84,427 |  | 76,350 |  | 68,363 |
A. The board of directors has proposed to the general shareholders' meeting the reclassification of the excess that the amount of the balance of the legal reserve account shows over the figure that is equivalent to 20% of the resulting share capital after the executed capital reductions, to be included in the voluntary reserves account. B. In accordance with the commercial regulations in force in Spain.
Schedule of reserves of subsidiaries based on the companies' contribution to the Group | The detail, by company, of Reserves of subsidiaries, based on the companies’ contribution to the Group (considering the effect of consolidation adjustments) is as follows:
EUR million
| 2025 | 2024 | 2023
Banco Santander (Brasil) S.A. (Consolidated Group) | 16,085 |  | 15,107 |  | 14,512 |
Santander UK Group | 7,973 |  | 8,576 |  | 8,700 |
Banco Santander México, S.A., Institución de Banca Múltiple, Grupo Financiero Santander México | 4,977 |  | 5,248 |  | 5,684 |
Santander Consumer Finance Group | 4,804 |  | 4,729 |  | 4,344 |
Banco Santander - Chile | 4,560 |  | 4,250 |  | 4,112 |
Banco Santander Argentina S.A. | 3,217 |  | 2,892 |  | 2,813 |
Banco Santander Totta, S.A. (Consolidated Group) | 2,726 |  | 2,766 |  | 2,626 |
Santander Bank Polska S.A. | 2,875 |  | 2,890 |  | 2,535 |
Grupo Santander Holdings USA | 63 |  | 187 |  | 1,893 |
Santander Investment, S.A. | 1,424 |  | 1,217 |  | 1,215 |
Santander Seguros y Reaseguros, Compañía Aseguradora, S.A. | 845 |  | 836 |  | 1,044 |
Banco Santander International SA (former Banco Santander (Suisse) S.A) | 450 |  | 397 |  | 346 |
Other companies and consolidation adjustments | (2,062) |  | (1,846) |  | (2,155) |
| 47,937 |  | 47,249 |  | 47,669 |
Of which, restricted | 4,722 |  | 4,175 |  | 3,870 |

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- Definition Tabular information related to Accumulated retained earnings and Reserves of entities accounted for using the equity method. + References No definition available. + Details
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