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Tangible assets - Narrative (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | € 26,416 | € 31,212 | € 32,926
Tangible assets | 27,438 | 32,087 | 33,882
For own use |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Tangible assets | 11,663 | 12,636 | 13,408
For own use | Abroad |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 6,545 | 6,531 | 7,119
Leased out under an operating lease |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Tangible assets | 14,753 | 18,576 | 19,518
Leased out under an operating lease | Vehicles | Santander US Auto |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Tangible assets | 7,227 | 11,336 | 12,525
Investment property |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Tangible assets | 1,022 | 875 | 956
Fair value of investment property | 1,194 | 1,041 | 1,163
Unrealized gains (losses) on fair value adjustment | € 172 | € 166 | € 207

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- Definition The amount of property, plant and equipment including right-of-use assets whose underlying assets would be presented as property, plant and equipment if they were owned. [Refer: Property, plant and equipment; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2025-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2025-en-r&anchor=para_73_e&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2025-01-01 -Paragraph 47 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2025-en-r&anchor=para_47_a&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 54 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_54_a&doctype=Standard -URIDate 2025-03-27 + Details
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