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v3.26.1

Remuneration and other benefits paid to the Bank’s directors and senior managers - Insurance (Details) - EUR (€) | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Disclosure of transactions between related parties [line items] |  |
Disbursed for payment of civil liability insurance premium | € 8,300,000 | € 13,500,000
Other directors | Life Insurance |  |
Disclosure of transactions between related parties [line items] |  |
Life insurance, amount | € 0 | € 0

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- Definition The amount of related-party commitments made on behalf of the entity to do something if a particular event occurs or does not occur in the future, including executory contracts (recognised and unrecognised). [Refer: Total for all related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2025-01-01 -Paragraph 21 -Subparagraph i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2025-en-r&anchor=para_21_i&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_CommitmentsMadeOnBehalfOfEntityRelatedPartyTransactions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- 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
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash outflow for payment of civil liability insurance premium. + References No definition available. + Details
Name: | san_PaymentOfCivilLiabilityInsurancePremium
Namespace Prefix: | san_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=san_OtherDirectorsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_InsuranceContractsAxis=san_LifeInsuranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |