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Risk management - Schedule of leverage capital and ratios (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Risk Management [Abstract] |  |  |
Level 1 Capital | € 94,385 | € 90,170 | € 85,742
Exposure | € 1,924,349 | € 1,885,572 | € 1,826,922
Leverage Ratio | 4.90% | 4.78% | 4.69%

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- Definition Tier 1 Leverage Capital divided by average assets as defined by international regulations. + References No definition available. + Details
Name: | san_IFRSTierOneLeverageCapitalToAverageAssets
Namespace Prefix: | san_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Tier 1 Leverage Capital as defined in international regulations. Also called Core Capital. + References No definition available. + Details
Name: | san_IfrsTierOneLeverageCapital
Namespace Prefix: | san_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | san_RiskManagementAbstract
Namespace Prefix: | san_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of average assets, as calculated in accordance with international regulatory capital standards. + References No definition available. + Details
Name: | san_TierOneLeverageCapitalExposureAverageAssets
Namespace Prefix: | san_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant