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Investments - Summary of financial information on the main associates and joint ventures (Details) - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of associates [line items] |  |  |  |
TOTAL ASSETS | € 1,867,515 | € 1,837,081 | € 1,797,062 |
TOTAL LIABILITIES | 1,754,767 | 1,729,754 | 1,692,821 |
Profit or loss for the year | 15,500 | 13,744 | 12,183 |
Other accumulated comprehensive income | (37,974) | (36,595) | (35,020) |
Equity | 112,748 | 107,327 | 104,241 | € 97,585
TOTAL LIABILITIES AND EQUITY | 1,867,515 | 1,837,081 | 1,797,062 |
Profit (loss) from continuing operations | 13,958 | 12,503 | 11,125 |
Profit/(loss) after tax from discontinued operations | 1,542 | € 1,241 | € 1,058 |
Aggregate amounts for entities accounted for using the equity method | Merlin Properties, SOCIMI, S.A. |  |  |  |
Disclosure of associates [line items] |  |  |  |
Current assets | 1,701 |  |  |
Non current assets | 11,758 |  |  |
TOTAL ASSETS | 13,459 |  |  |
Current liabilities | 840 |  |  |
Non current liabilities | 5,118 |  |  |
TOTAL LIABILITIES | 5,958 |  |  |
Profit or loss for the year | 284 |  |  |
Other accumulated comprehensive income | (11) |  |  |
Rest of equity | 7,228 |  |  |
Equity | 7,501 |  |  |
TOTAL LIABILITIES AND EQUITY | 13,459 |  |  |
Ordinary activities income | 544 |  |  |
Profit (loss) from continuing operations | 284 |  |  |
Profit/(loss) after tax from discontinued operations | 0 |  |  |
Aggregate amounts for entities accounted for using the equity method | Metrovacesa, S.A. |  |  |  |
Disclosure of associates [line items] |  |  |  |
Current assets | 2,025 |  |  |
Non current assets | 389 |  |  |
TOTAL ASSETS | 2,414 |  |  |
Current liabilities | 507 |  |  |
Non current liabilities | 310 |  |  |
TOTAL LIABILITIES | 817 |  |  |
Profit or loss for the year | 16 |  |  |
Other accumulated comprehensive income | 0 |  |  |
Rest of equity | 1,581 |  |  |
Equity | 1,597 |  |  |
TOTAL LIABILITIES AND EQUITY | 2,414 |  |  |
Ordinary activities income | 658 |  |  |
Profit (loss) from continuing operations | 16 |  |  |
Profit/(loss) after tax from discontinued operations | 0 |  |  |
Aggregate amounts for entities accounted for using the equity method | Pluxee Beneficios Brasil, S.A. |  |  |  |
Disclosure of associates [line items] |  |  |  |
Current assets | 689 |  |  |
Non current assets | 652 |  |  |
TOTAL ASSETS | 1,341 |  |  |
Current liabilities | 254 |  |  |
Non current liabilities | 578 |  |  |
TOTAL LIABILITIES | 832 |  |  |
Profit or loss for the year | 87 |  |  |
Other accumulated comprehensive income | 0 |  |  |
Rest of equity | 422 |  |  |
Equity | 509 |  |  |
TOTAL LIABILITIES AND EQUITY | 1,341 |  |  |
Ordinary activities income | 457 |  |  |
Profit (loss) from continuing operations | 87 |  |  |
Profit/(loss) after tax from discontinued operations | 0 |  |  |
Aggregate amounts for entities accounted for using the equity method | Zurich Santander Insurance America, S.L. - Consolidated |  |  |  |
Disclosure of associates [line items] |  |  |  |
Current assets | 2,434 |  |  |
Non current assets | 20,190 |  |  |
TOTAL ASSETS | 22,624 |  |  |
Current liabilities | 657 |  |  |
Non current liabilities | 21,021 |  |  |
TOTAL LIABILITIES | 21,678 |  |  |
Profit or loss for the year | 534 |  |  |
Other accumulated comprehensive income | (33) |  |  |
Rest of equity | 445 |  |  |
Equity | 946 |  |  |
TOTAL LIABILITIES AND EQUITY | 22,624 |  |  |
Ordinary activities income | 4,559 |  |  |
Profit (loss) from continuing operations | 534 |  |  |
Profit/(loss) after tax from discontinued operations | 0 |  |  |
Aggregate amounts for entities accounted for using the equity method | CNP Santander |  |  |  |
Disclosure of associates [line items] |  |  |  |
Current assets | 165 |  |  |
Non current assets | 2,139 |  |  |
TOTAL ASSETS | 2,304 |  |  |
Current liabilities | 186 |  |  |
Non current liabilities | 1,726 |  |  |
TOTAL LIABILITIES | 1,912 |  |  |
Profit or loss for the year | 101 |  |  |
Other accumulated comprehensive income | (9) |  |  |
Rest of equity | 300 |  |  |
Equity | 392 |  |  |
TOTAL LIABILITIES AND EQUITY | 2,304 |  |  |
Ordinary activities income | 568 |  |  |
Profit (loss) from continuing operations | 101 |  |  |
Profit/(loss) after tax from discontinued operations | 0 |  |  |
Aggregate amounts for entities accounted for using the equity method | Santander Caceis Latam Holding 1, S.L |  |  |  |
Disclosure of associates [line items] |  |  |  |
Current assets | 201 |  |  |
Non current assets | 579 |  |  |
TOTAL ASSETS | 780 |  |  |
Current liabilities | 315 |  |  |
Non current liabilities | 35 |  |  |
TOTAL LIABILITIES | 350 |  |  |
Profit or loss for the year | 97 |  |  |
Other accumulated comprehensive income | 0 |  |  |
Rest of equity | 333 |  |  |
Equity | 430 |  |  |
TOTAL LIABILITIES AND EQUITY | 780 |  |  |
Ordinary activities income | 163 |  |  |
Profit (loss) from continuing operations | 97 |  |  |
Profit/(loss) after tax from discontinued operations | 0 |  |  |
Aggregate amounts for entities accounted for using the equity method | U.C.I., S.A. |  |  |  |
Disclosure of associates [line items] |  |  |  |
Current assets | 397 |  |  |
Non current assets | 8,876 |  |  |
TOTAL ASSETS | 9,273 |  |  |
Current liabilities | 6,930 |  |  |
Non current liabilities | 1,715 |  |  |
TOTAL LIABILITIES | 8,645 |  |  |
Profit or loss for the year | (75) |  |  |
Other accumulated comprehensive income | 114 |  |  |
Rest of equity | 589 |  |  |
Equity | 628 |  |  |
TOTAL LIABILITIES AND EQUITY | 9,273 |  |  |
Ordinary activities income | 499 |  |  |
Profit (loss) from continuing operations | (75) |  |  |
Profit/(loss) after tax from discontinued operations | 0 |  |  |
Aggregate amounts for entities accounted for using the equity method | Hyundai Capital UK Limited |  |  |  |
Disclosure of associates [line items] |  |  |  |
Current assets | 2,022 |  |  |
Non current assets | 3,665 |  |  |
TOTAL ASSETS | 5,687 |  |  |
Current liabilities | 3,685 |  |  |
Non current liabilities | 1,480 |  |  |
TOTAL LIABILITIES | 5,165 |  |  |
Profit or loss for the year | 77 |  |  |
Other accumulated comprehensive income | (1) |  |  |
Rest of equity | 446 |  |  |
Equity | 522 |  |  |
TOTAL LIABILITIES AND EQUITY | 5,687 |  |  |
Ordinary activities income | 426 |  |  |
Profit (loss) from continuing operations | 77 |  |  |
Profit/(loss) after tax from discontinued operations | 0 |  |  |
Aggregate amounts for entities accounted for using the equity method | Fortune Auto Finance Co., Ltd |  |  |  |
Disclosure of associates [line items] |  |  |  |
Current assets | 167 |  |  |
Non current assets | 1,933 |  |  |
TOTAL ASSETS | 2,100 |  |  |
Current liabilities | 10 |  |  |
Non current liabilities | 1,627 |  |  |
TOTAL LIABILITIES | 1,637 |  |  |
Profit or loss for the year | 20 |  |  |
Other accumulated comprehensive income | 0 |  |  |
Rest of equity | 443 |  |  |
Equity | 463 |  |  |
TOTAL LIABILITIES AND EQUITY | 2,100 |  |  |
Ordinary activities income | 159 |  |  |
Profit (loss) from continuing operations | 20 |  |  |
Profit/(loss) after tax from discontinued operations | 0 |  |  |
Aggregate amounts for entities accounted for using the equity method | Santander Seguros y Reaseguros, Compañía Aseguradora, S.A. |  |  |  |
Disclosure of associates [line items] |  |  |  |
Current assets | 157 |  |  |
Non current assets | 1,710 |  |  |
TOTAL ASSETS | 1,867 |  |  |
Current liabilities | 140 |  |  |
Non current liabilities | 1,243 |  |  |
TOTAL LIABILITIES | 1,383 |  |  |
Profit or loss for the year | 145 |  |  |
Other accumulated comprehensive income | (21) |  |  |
Rest of equity | 360 |  |  |
Equity | 484 |  |  |
TOTAL LIABILITIES AND EQUITY | 1,867 |  |  |
Ordinary activities income | 907 |  |  |
Profit (loss) from continuing operations | 145 |  |  |
Profit/(loss) after tax from discontinued operations | 0 |  |  |
Aggregate amounts for entities accounted for using the equity method | Banco RCI Brasil S.A. |  |  |  |
Disclosure of associates [line items] |  |  |  |
Current assets | 10 |  |  |
Non current assets | 2,221 |  |  |
TOTAL ASSETS | 2,231 |  |  |
Current liabilities | 112 |  |  |
Non current liabilities | 1,924 |  |  |
TOTAL LIABILITIES | 2,036 |  |  |
Profit or loss for the year | 54 |  |  |
Other accumulated comprehensive income | 4 |  |  |
Rest of equity | 137 |  |  |
Equity | 195 |  |  |
TOTAL LIABILITIES AND EQUITY | 2,231 |  |  |
Ordinary activities income | 312 |  |  |
Profit (loss) from continuing operations | 54 |  |  |
Profit/(loss) after tax from discontinued operations | € 0 |  |  |

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