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Marketable debt securities - Disclosure of changes in bonds and debentures outstanding (Details) - Marketable debt securities - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Changes in financial instruments, Liabilities |  |  |
Balance at beginning of year | € 325,521 | € 308,579 |
Balance at year-end | 324,390 | 325,521 | € 308,579
Bonds and debentures outstanding |  |  |
Changes in financial instruments, Liabilities |  |  |
Balance at beginning of year | 252,765 | 231,880 | 211,597
Net inclusion, fair value measurement, liabilities | 0 | (1,224) | (1,467)
Issues | 72,014 | 77,921 | 68,568
Redemptions and repurchases | (60,335) | (57,676) | (48,825)
Exchange differences and other movements | (10,551) | 1,864 | 2,007
Balance at year-end | 253,893 | 252,765 | 231,880
Bonds and debentures outstanding | Banco Santander, S.A. |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 12,682 | 20,559 | 19,706
Redemptions and repurchases | (14,854) | (15,888) | (7,889)
Bonds and debentures outstanding | SPIRE SA Compartment 2023-374 |  |  |
Changes in financial instruments, Liabilities |  |  |
Net inclusion, fair value measurement, liabilities | 0 | (1,224) | 0
Bonds and debentures outstanding | Auto ABS UK Loans PLC |  |  |
Changes in financial instruments, Liabilities |  |  |
Net inclusion, fair value measurement, liabilities | 0 | 0 | (841)
Bonds and debentures outstanding | PSA Bank Deutschland GmbH |  |  |
Changes in financial instruments, Liabilities |  |  |
Net inclusion, fair value measurement, liabilities | 0 | 0 | (626)
Bonds and debentures outstanding | Banco Santander (Brasil) S.A. |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 11,827 | 8,039 | 12,781
Redemptions and repurchases | (9,430) | (6,919) | (10,542)
Bonds and debentures outstanding | Santander Group UK |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 11,450 | 9,884 | 6,002
Redemptions and repurchases | (4,936) | (7,764) | (6,185)
Bonds and debentures outstanding | Santander Consumer USA Holdings Inc. |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 8,705 | 8,949 | 7,309
Redemptions and repurchases | (7,905) | (10,806) | (14,466)
Bonds and debentures outstanding | Santander International Products, Plc. |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 5,071 | 2,752 | 1,054
Redemptions and repurchases | (1,327) | (584) | (728)
Bonds and debentures outstanding | Stellantis Financial Services Italia S.p.A. |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 2,020 | 2,021 | 761
Redemptions and repurchases | (698) | (22) | 0
Bonds and debentures outstanding | Santander Consumer Bank S.p.A. |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 1,799 | 1,001 | 1,460
Redemptions and repurchases | (1,327) | (233) | (266)
Bonds and debentures outstanding | Santander Holdings USA, Inc. |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 1,772 | 3,004 | 1,850
Redemptions and repurchases | (2,693) | (1,387) | 0
Bonds and debentures outstanding | Fondo de Titulización, Santander Consumo 8 |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 1,523 | 0 | 0
Bonds and debentures outstanding | Fondo de Titulización, Santander Consumo 9 |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 1,421 | 0 | 0
Bonds and debentures outstanding | Banco Santander - Chile |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 1,204 | 1,171 | 814
Redemptions and repurchases | (1,930) | (1,486) | (575)
Bonds and debentures outstanding | Santander Consumer Finance, S.A. |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 1,181 | 2,271 | 2,557
Redemptions and repurchases | (2,743) | (2,900) | (1,800)
Bonds and debentures outstanding | Banco Santander Totta, S.A. |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 1,069 | 1,129 | 1,734
Redemptions and repurchases | (223) | (1,055) | (108)
Bonds and debentures outstanding | Santander Bank, National Association |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 853 | 4,133 | 1,346
Redemptions and repurchases | (2,648) | (1,440) | (567)
Bonds and debentures outstanding | SC Germany S.A., Compartment Consumer 2025-2 |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 850 | 0 | 0
Bonds and debentures outstanding | SC Austria S.à r.l., Compartment Consumer 2025-1 |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 803 | 0 | 0
Bonds and debentures outstanding | Secucor Finance 2025-1 Designated Activity Company |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 801 | 0 | 0
Bonds and debentures outstanding | Banco Santander México, S.A., Institución de Banca Múltiple, Grupo Financiero Santander México |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 787 | 875 | 634
Redemptions and repurchases | (2,084) | (122) | (140)
Bonds and debentures outstanding | Hyundai Capital Bank Europe GmbH Italy |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 749 | 0 | 0
Bonds and debentures outstanding | Banque Stellantis France |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 728 | 897 | 1,145
Redemptions and repurchases | (746) | (565) | (813)
Bonds and debentures outstanding | Santander Consumer Bank AG |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 0 | 180 | 1,256
Bonds and debentures outstanding | SC Germany S.A., Compartment Consumer 2024-1 |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 0 | 1,500 | 0
Bonds and debentures outstanding | Santander Consumo 6, F.T. |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 0 | 1,230 | 0
Bonds and debentures outstanding | Santander Consumo 7, F.T. |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 0 | 1,218 | 0
Bonds and debentures outstanding | Santander Bank Polska S.A. |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 0 | 1,002 | 1,102
Bonds and debentures outstanding | SC Germany S.A., Compartment Consumer 2024-2 |  |  |
Changes in financial instruments, Liabilities |  |  |
Issues | 0 | 1,000 | 0
Bonds and debentures outstanding | Santander Consumer Bank AS |  |  |
Changes in financial instruments, Liabilities |  |  |
Redemptions and repurchases | € (1,174) | € (839) | € (681)

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