XML 353 R271.htm IDEA: XBRL DOCUMENT
v3.26.1

Accumulated retained earnings - Schedule of reserves of subsidiaries based on the companies' contribution to the Group (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Disclosure of reserves within equity [line items] |  |  |
Reserves of subsidiaries | € 47,937 | € 47,249 | € 47,669
Restricted portion of reserves of subsidiaries | 4,722 | 4,175 | 3,870
Banco Santander (Brasil) S.A. |  |  |
Disclosure of reserves within equity [line items] |  |  |
Reserves of subsidiaries | 16,085 | 15,107 | 14,512
Santander UK Group |  |  |
Disclosure of reserves within equity [line items] |  |  |
Reserves of subsidiaries | 7,973 | 8,576 | 8,700
Banco Santander México, S.A., Institución de Banca Múltiple, Grupo Financiero Santander México |  |  |
Disclosure of reserves within equity [line items] |  |  |
Reserves of subsidiaries | 4,977 | 5,248 | 5,684
Santander Consumer Finance Group |  |  |
Disclosure of reserves within equity [line items] |  |  |
Reserves of subsidiaries | 4,804 | 4,729 | 4,344
Banco Santander - Chile |  |  |
Disclosure of reserves within equity [line items] |  |  |
Reserves of subsidiaries | 4,560 | 4,250 | 4,112
Banco Santander Argentina S.A. |  |  |
Disclosure of reserves within equity [line items] |  |  |
Reserves of subsidiaries | 3,217 | 2,892 | 2,813
Banco Santander Totta, S.A. |  |  |
Disclosure of reserves within equity [line items] |  |  |
Reserves of subsidiaries | 2,726 | 2,766 | 2,626
Santander Bank Polska S.A. |  |  |
Disclosure of reserves within equity [line items] |  |  |
Reserves of subsidiaries | 2,875 | 2,890 | 2,535
Santander Holdings USA, Inc. |  |  |
Disclosure of reserves within equity [line items] |  |  |
Reserves of subsidiaries | 63 | 187 | 1,893
Santander Investment, S.A. |  |  |
Disclosure of reserves within equity [line items] |  |  |
Reserves of subsidiaries | 1,424 | 1,217 | 1,215
Santander Seguros y Reaseguros, Compañía Aseguradora, S.A. |  |  |
Disclosure of reserves within equity [line items] |  |  |
Reserves of subsidiaries | 845 | 836 | 1,044
Banco Santander International SA (former Banco Santander (Suisse) S.A) |  |  |
Disclosure of reserves within equity [line items] |  |  |
Reserves of subsidiaries | 450 | 397 | 346
Other companies and consolidation adjustments |  |  |
Disclosure of reserves within equity [line items] |  |  |
Reserves of subsidiaries | € (2,062) | € (1,846) | € (2,155)

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfReservesWithinEquityLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition A component of equity representing reserves of subsidiaries. + References No definition available. + Details
Name: | san_ReservesOfSubsidiaries
Namespace Prefix: | san_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition A component of equity representing the portion of reserves for subsidiaries restricted as to usage. + References No definition available. + Details
Name: | san_ReservesOfSubsidiariesRestricted
Namespace Prefix: | san_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=san_BancoSantanderBrasilSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=san_SantanderUKGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=san_BancoSantanderMexicoSAInstitucionDeBancaMultipleGrupoFinancieroSantanderMexicoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=san_SantanderConsumerFinanceGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=san_BancoSantanderChileMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=san_BancoSantanderArgentinaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=san_BancoSantanderTottaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=san_SantanderBankPolskaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=san_SantanderHoldingsUSAIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=san_SantanderInvestmentSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=san_SantanderSegurosYReasegurosCompaniaAseguradoraSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=san_BancoSantanderInternationalSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=san_OtherCompaniesExchangeDifferencesAndConsolidationAdjustmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |