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Investments - Summary of changes in investments (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of associates [line items] |  |  |
Balance at beginning of year | € 7,277 | € 7,646 | € 7,615
Acquisitions (disposals) of companies and capital increases (reductions) | (17) | 1,011 | 52
Changes in the consolidation method (Note 3) | 15 | (13) | (43)
Entities for sale (Notes 3 y 12) | (168) | (1,137) | 0
Effect of equity accounting | 665 | 687 | 591
Dividends distributed and reimbursements of share premium | (694) | (745) | (565)
Other global result | 28 | (32) | (24)
Exchange differences and other changes | (54) | (140) | 20
Balance at end of year | 7,052 | 7,277 | 7,646
Zurich Santander Insurance America, S.L. - Consolidated |  |  |
Disclosure of associates [line items] |  |  |
Dividends distributed and reimbursements of share premium | (206) | (202) | (202)
Metrovacesa, S.A. |  |  |
Disclosure of associates [line items] |  |  |
Dividends distributed and reimbursements of share premium | (118) | (52) | (50)
Merlin Properties, SOCIMI, S.A. |  |  |
Disclosure of associates [line items] |  |  |
Dividends distributed and reimbursements of share premium | (57) | (53) | (51)
CNP Santander |  |  |
Disclosure of associates [line items] |  |  |
Dividends distributed and reimbursements of share premium | (54) | (88) | (51)
CIP S.A. |  |  |
Disclosure of associates [line items] |  |  |
Dividends distributed and reimbursements of share premium | (16) | (56) | 0
Caceis (Notes 3 and 12) |  |  |
Disclosure of associates [line items] |  |  |
Dividends distributed and reimbursements of share premium | 0 | (114) | 0
Hyundai Capital UK Limited |  |  |
Disclosure of associates [line items] |  |  |
Dividends distributed and reimbursements of share premium | 0 | € 0 | (58)
Pluxee Beneficios Brasil, S.A. |  |  |
Disclosure of associates [line items] |  |  |
Percentage of voting equity interests acquired |  | 20.00% |
Santander Vida Seguros y Reaseguros, S.A. |  |  |
Disclosure of associates [line items] |  |  |
Dividends distributed and reimbursements of share premium | € (87) | € (82) | € (52)

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- Definition The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2025-01-01 -Paragraph 24 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_24_a&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2025-01-01 -Paragraph B16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_B16&doctype=Appendix&subtype=B -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 89 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_89&doctype=Standard -URIDate 2025-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 89 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_89&doctype=Standard -URIDate 2025-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 54 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_54_e&doctype=Standard -URIDate 2025-03-27 + Details
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