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Risk management - Schedule of regulatory capital phase-in coefficients (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Risk Management [Abstract] |  |  |
Level 1 ordinary eligible capital (EUR million) | € 84,739 | € 79,800 | € 76,741
Level 1 additional eligible capital (EUR million) | 9,645 | 10,371 | 9,002
Level 2 eligible capital (EUR million) | 17,460 | 18,418 | 16,497
Risk-weighted assets (EUR million) | € 629,430 | € 624,503 | € 623,731
Level 1 ordinary capital coefficient (CET 1) | 13.46% | 12.78% | 12.30%
Level 1 additional capital coefficient (AT1) | 1.53% | 1.66% | 1.45%
Level 1 capital coefficient (TIER1) | 15.00% | 14.44% | 13.75%
Level 2 capital coefficient (TIER 2) | 2.77% | 2.95% | 2.64%
Total capital coefficient | 17.77% | 17.39% | 16.39%

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- Definition Percentage of Common Equity Tier One Risk-based Capital to total risk-weighted assets, as defined by regulatory framework. + References No definition available. + Details
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- Definition Amount of Common Equity Tier 1 Risk-based Capital required to be categorized as adequately capitalized under regulatory framework for prompt corrective action. Also known as "ordinary eligible capital." + References No definition available. + Details
Name: | san_CommonEquityTierOneCapitalRequiredForCapitalAdequacy1
Namespace Prefix: | san_
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- Definition Total Capital divided by risk weighted assets as defined in the international regulations. + References No definition available. + Details
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- Definition Tier 1 capital divided by risk weighted assets as defined by international regulations. + References No definition available. + Details
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- Definition Percentage of Common Equity Tier Two Risk-based Capital to total risk-weighted assets, as defined by regulatory framework. + References No definition available. + Details
Name: | san_IFRSTierTwoRiskBasedCapitalToRiskWeightedAssets
Namespace Prefix: | san_
Data Type: | dtr-types1:percentItemType
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- Definition Amount of risk-weighted assets as calculated in accordance with international regulatory capital standards. + References No definition available. + Details
Name: | san_IfrsRiskWeightedAssets
Namespace Prefix: | san_
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- Definition Tier 2 risk-based capital as defined in the international regulations. + References No definition available. + Details
Name: | san_IfrsTierTwoRiskBasedCapital
Namespace Prefix: | san_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- References No definition available. + Details
Name: | san_RiskManagementAbstract
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- Definition The amount by which the company's Common Equity Tier One Capital exceeds the minimum required for capital adequacy purposes. Also known as "additional eligible capital." + References No definition available. + Details
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Namespace Prefix: | san_
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Balance Type: | credit
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- Definition The amount of Tier 1 capital beyond that included in Common Equity Tier 1 capital divided by risk-weighted assets, which are assets that are weighted for credit risk. + References No definition available. + Details
Name: | san_TierOneCapitalInExcessOfCommonEquityTierOneCapitalPercentageOfRiskWeightedAssets
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