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Accounting policies - Non-current assets and liabilities associated with non-current assets held for sale (Details) - EUR (€) € in Millions | 12 Months Ended |
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Dec. 31, 2025 | Dec. 31, 2024
Disclosure of fair value measurement of assets [line items] |  |
Maximum percentage of appraisal company's total billings to Group | 15.00% |
Fair value less costs to sell of non-current assets held for sale exceeding carrying amount | € 551 | € 553
Spain |  |
Disclosure of fair value measurement of assets [line items] |  |
Percentage of entity's total non-current assets held for sale | 76.00% |

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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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- Definition Maximum percentage of appraisal company's total billings that may be attributable to entity under entity's corporate policy related to independence in twelve month period. + References No definition available. + Details
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- Definition Percentage of entity's total non-current assets classified as held for sale. + References No definition available. + Details
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Namespace Prefix: | san_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The net excess or deficiency of the fair value less costs to sell of non-current assets held for sale over or under carrying amount, which excess value or deficiency has not been recognized in earnings of the entity. + References No definition available. + Details
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- Details
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