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Deposits from central banks and credit institutions - Narrative (Details) - TLTRO III - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure Of Deposits [Line Items] |  |  |
Deposits from central banks at amortised cost due to participation in the refinancing operations program | € 0 | € 0 | € 11,583
Income (expense) from participation in refinancing operations program | € 0 | € 158 | € 659

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- Definition Represents the deposits from central banks at amortised cost due to participation in refinancing operations program. + References No definition available. + Details
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- Definition Disclosure Of Deposits [Line Items] + References No definition available. + Details
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- Definition Income (Expense) From Participation In Refinancing Operations Program + References No definition available. + Details
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Namespace Prefix: | san_
Data Type: | xbrli:monetaryItemType
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |