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Remuneration and other benefits paid to the Bank’s directors and senior managers - Schedule summarising attendance fees (Details) - EUR (€) | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Board of directors |  |
Disclosure of transactions between related parties [line items] |  |
Attendance fees and commissions per meeting | € 2,785 | € 2,704
Audit committee and risk supervision, regulation and compliance committee |  |
Disclosure of transactions between related parties [line items] |  |
Attendance fees and commissions per meeting | 1,821 | 1,768
Other committees (excluding executive committee) |  |
Disclosure of transactions between related parties [line items] |  |
Attendance fees and commissions per meeting | € 1,606 | € 1,560

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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_
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- Definition The amount of compensation paid per meeting, per director, for attendance fees and commissions. + References No definition available. + Details
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Namespace Prefix: | san_
Data Type: | xbrli:monetaryItemType
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |