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Insurance contracts linked to pensions (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] |  |  |
Insurance contracts that are assets | € 67 | € 81 | € 93
Banco Santander, S.A. |  |  |
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] |  |  |
Insurance contracts that are assets | € 67 | € 81 | € 93

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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 The amount of insurance contracts issued that are assets. [Refer: Assets; Insurance contracts issued [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 78 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_78_a&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 54 -Subparagraph da -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_54_da&doctype=Standard -URIDate 2025-03-27 + Details
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