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Other general administrative expenses - Schedule of detail of other general administrative expenses (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Selling, general and administrative expense [abstract] |  |  |
Technology and systems | € 803 | € 2,539 | € 2,389
Property, fixtures and supplies (note 2.k) | 2,298 | 797 | 774
Technical reports | 712 | 724 | 796
Advertising | 517 | 512 | 574
Taxes other than income tax | 543 | 554 | 568
Communications | 367 | 387 | 400
Surveillance and cash courier services | 314 | 337 | 325
Per diems and travel expenses | 250 | 232 | 213
Insurance premiums | 86 | 95 | 88
Other administrative expenses | 2,055 | 2,008 | 2,172
Other general administrative expenses | € 7,945 | € 8,185 | € 8,299

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- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_112_c&doctype=Standard -URIDate 2025-03-27 + Details
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- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_112_c&doctype=Standard -URIDate 2025-03-27 + Details
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- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_112_c&doctype=Standard -URIDate 2025-03-27 + Details
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- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_85&doctype=Standard -URIDate 2025-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_112_c&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition Expenses the entity classifies as administrative. + References No definition available. + Details
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- Definition Other General Administrative Expenses + References No definition available. + Details
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- Definition The amount of expense relating to surveillance and courier services. + References No definition available. + Details
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Namespace Prefix: | san_
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Balance Type: | debit
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- Definition The amount of expense relating to technical reports. + References No definition available. + Details
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Namespace Prefix: | san_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of expense relating to technology and systems. + References No definition available. + Details
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Namespace Prefix: | san_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration