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Intangible assets - Goodwill - Disclosure of detailed information about goodwill (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Cash-generating units information |  |  |  |
Goodwill | € 11,958 | € 13,438 | € 14,017 | € 13,741
Banco Santander (Brasil) S.A. |  |  |  |
Cash-generating units information |  |  |  |
Goodwill | 3,031 | 3,079 | 3,679 |
SAM Investment Holdings Limited |  |  |  |
Cash-generating units information |  |  |  |
Goodwill | 1,444 | 1,444 | 1,444 |
Santander Consumer Germany |  |  |  |
Cash-generating units information |  |  |  |
Goodwill | 1,304 | 1,304 | 1,304 |
Santander Portugal |  |  |  |
Cash-generating units information |  |  |  |
Goodwill | 1,040 | 1,040 | 1,040 |
Santander España |  |  |  |
Cash-generating units information |  |  |  |
Goodwill | 998 | 998 | 998 |
Santander US Auto |  |  |  |
Cash-generating units information |  |  |  |
Goodwill | 943 | 1,068 | 1,003 |
Santander Holding USA (ex. Auto) |  |  |  |
Cash-generating units information |  |  |  |
Goodwill | 765 | 865 | 814 |
Santander UK |  |  |  |
Cash-generating units information |  |  |  |
Goodwill | 609 | 641 | 612 |
Banco Santander - Chile |  |  |  |
Cash-generating units information |  |  |  |
Goodwill | 470 | 482 | 516 |
Grupo Financiero Santander (México) |  |  |  |
Cash-generating units information |  |  |  |
Goodwill | 463 | 453 | 523 |
Ebury Partners Ltd |  |  |  |
Cash-generating units information |  |  |  |
Goodwill | 326 | 340 | 350 |
Santander Consumer Nordics |  |  |  |
Cash-generating units information |  |  |  |
Goodwill | 211 | 211 | 206 |
Santander Bank Polska S.A. |  |  |  |
Cash-generating units information |  |  |  |
Goodwill | 0 | 1,178 | 1,159 |
Other companies |  |  |  |
Cash-generating units information |  |  |  |
Goodwill | € 354 | € 335 | € 369 |

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