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Deposits from central banks and credit institutions (Tables) | 12 Months Ended
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Dec. 31, 2025
Deposits From Central Banks And Credit Institutions [Abstract] |
Schedule of deposits from central banks and credit institutions | The detail, by classification, counterparty, type and currency, of 'Deposits from central banks' and 'Deposits from credit institutions' in the consolidated balance sheets is as follows:
EUR million
| 2025 | 2024 | 2023
CENTRAL BANKS |  |  |
Classification |  |  |
Financial liabilities held for trading | 12,385 |  | 13,300 |  | 7,808 |
Financial liabilities designated at fair value through profit or loss | 3,086 |  | 1,774 |  | 1,209 |
Financial liabilities at amortized cost | 18,542 |  | 24,882 |  | 48,782 |
| 34,013 |  | 39,956 |  | 57,799 |
Type |  |  |
Deposits on demand | 856 |  | 405 |  | 117 |
Time deposits | 14,709 |  | 18,488 |  | 43,853 |
Reverse repurchase agreements | 18,448 |  | 21,063 |  | 13,829 |
| 34,013 |  | 39,956 |  | 57,799 |
CREDIT INSTITUTIONS |  |  |
Classification |  |  |
Financial liabilities held for trading | 27,058 |  | 26,284 |  | 17,862 |
Financial liabilities designated at fair value through profit or loss | 1,424 |  | 1,625 |  | 1,735 |
Financial liabilities at amortized cost | 74,692 |  | 90,012 |  | 81,246 |
| 103,174 |  | 117,921 |  | 100,843 |
Type |  |  |
Deposits on demand | 5,005 |  | 6,657 |  | 5,468 |
Time deposits | 42,718 |  | 54,716 |  | 54,402 |
Reverse repurchase agreements | 55,186 |  | 56,273 |  | 40,689 |
Subordinated deposits | 265 |  | 275 |  | 284 |
| 103,174 |  | 117,921 |  | 100,843 |
Currency |  |  |
Euro | 54,588 |  | 53,779 |  | 53,921 |
Pound sterling | 13,625 |  | 21,853 |  | 27,697 |
US dollar | 43,466 |  | 57,992 |  | 49,447 |
Brazilian real | 6,783 |  | 7,459 |  | 7,997 |
Other currencies | 18,725 |  | 16,794 |  | 19,580 |
TOTAL | 137,187 |  | 157,877 |  | 158,642 |

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- Definition Deposits From Banks [Abstract] + References No definition available. + Details
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Namespace Prefix: | san_
Data Type: | xbrli:stringItemType
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- Definition The detail, by classification, counterparty, type and currency, of Deposits from central banks and Deposits from credit institutions in the consolidated balance sheets. + References No definition available. + Details
Name: | san_ScheduleOfDepositsFromCentralBanksAndCreditInstitutionsTableTextBlock
Namespace Prefix: | san_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration