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Subordinated liabilities - Schedule of changes in subordinated liabilities (Details) - Financial liabilities at amortised cost - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Financial instruments |  |  |
Balance at beginning of year | € 35,813 | € 30,912 | € 25,926
Net inclusion of entities in the Group | 0 | 0 | (40)
Issuances | 2,287 | 7,001 | 7,007
Redemptions and repurchases | (7,110) | (2,572) | (1,781)
Exchange differences and other movements | (1,703) | 472 | (200)
Balance at end of year | 29,287 | 35,813 | 30,912
Net issuances, redemptions and repurchases | 4,823 |  |
Interest paid in remuneration of issuances | 1,560 |  |
Banco Santander (Brasil) S.A. |  |  |
Financial instruments |  |  |
Issuances | 375 | 1,338 | 1,112
Banque Stellantis France |  |  |
Financial instruments |  |  |
Issuances | 0 | 25 | 150
Redemptions and repurchases | 0 | 0 | (78)
Santander UK Group Holdings plc |  |  |
Financial instruments |  |  |
Redemptions and repurchases | (352) | 0 | 0
Santander Bank Polska S.A. |  |  |
Financial instruments |  |  |
Redemptions and repurchases | 0 | (100) | 0
Santander UK plc |  |  |
Financial instruments |  |  |
Redemptions and repurchases | 0 | 0 | (702)
Banco Santander, S.A. |  |  |
Financial instruments |  |  |
Issuances | 1,862 | 5,625 | 5,610
Redemptions and repurchases | € (6,754) | € (2,433) | € (1,000)

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- Definition The amount of liabilities that are subordinate to other liabilities with respect to claims. + 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 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
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