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Investments - Summary of investments by company (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Disclosure of associates [line items] |  |  |  |
Associated entities | € 5,096 | € 5,216 | € 5,682 |
Joint venture entities | 1,956 | 2,061 | 1,964 |
INVESTMENTS | 7,052 | 7,277 | 7,646 | € 7,615
Santander Caceis Latam Holding 1, S.L |  |  |  |
Disclosure of associates [line items] |  |  |  |
Joint venture entities | 404 | 381 | 389 |
Santander Vida Seguros y Reaseguros, S.A. |  |  |  |
Disclosure of associates [line items] |  |  |  |
Joint venture entities | 329 | 356 | 362 |
U.C.I., S.A. |  |  |  |
Disclosure of associates [line items] |  |  |  |
Joint venture entities | 293 | 325 | 349 |
Fortune Auto Finance Co., Ltd |  |  |  |
Disclosure of associates [line items] |  |  |  |
Joint venture entities | 232 | 261 | 254 |
Hyundai Capital UK Limited |  |  |  |
Disclosure of associates [line items] |  |  |  |
Joint venture entities | 270 | 249 | 205 |
Volvo Car Financial Services UK Limited |  |  |  |
Disclosure of associates [line items] |  |  |  |
Joint venture entities | 116 | 99 | 76 |
Banco RCI Brasil S.A. |  |  |  |
Disclosure of associates [line items] |  |  |  |
Joint venture entities | 77 | 94 | 92 |
Other companies |  |  |  |
Disclosure of associates [line items] |  |  |  |
Joint venture entities | 235 | 296 | 237 |
Merlin Properties, SOCIMI, S.A. |  |  |  |
Disclosure of associates [line items] |  |  |  |
Associated entities | 1,830 | 1,803 | 1,621 |
Zurich Santander Insurance America, S.L. - Consolidated |  |  |  |
Disclosure of associates [line items] |  |  |  |
Associated entities | 940 | 884 | 936 |
Metrovacesa, S.A. |  |  |  |
Disclosure of associates [line items] |  |  |  |
Associated entities | 748 | 841 | 899 |
CNP Santander |  |  |  |
Disclosure of associates [line items] |  |  |  |
Associated entities | 399 | 397 | 423 |
Pluxee Beneficios Brasil, S.A. |  |  |  |
Disclosure of associates [line items] |  |  |  |
Associated entities | 295 | € 309 | 0 |
Percentage of voting equity interests acquired |  | 20.00% |  |
Caceis (Notes 3 and 12) |  |  |  |
Disclosure of associates [line items] |  |  |  |
Associated entities | 0 | € 0 | 1,139 |
Other companies |  |  |  |
Disclosure of associates [line items] |  |  |  |
Associated entities | € 884 | € 982 | € 664 |

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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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