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v3.26.1

Remuneration and other benefits paid to the Bank’s directors and senior managers - Contract termination (Details) | 12 Months Ended
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Dec. 31, 2025
Chairman | Ana Botín |
Disclosure of transactions between related parties [line items] |
Contract termination, notice period | 4 months

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

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- Definition Contract Termination, Notice Period + References No definition available. + Details
Name: | san_ContractTerminationNoticePeriod
Namespace Prefix: | san_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_TitleOfIndividualAxis=srt_BoardOfDirectorsChairmanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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