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Accumulated retained earnings - Narrative (Details) | 12 Months Ended
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Dec. 31, 2025
Retained earnings [abstract] |
Percentage of annual net profit required to be transferred to the legal reserve | 10.00%
Percentage of share capital required to be maintained in the legal reserve before annual transfers can be discontinued | 20.00%
Minimum percentage of increased share capital required to be maintained in the legal reserve if reserves are used to increase capital | 10.00%

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

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- Definition Minimum percentage of the increased share capital required to be maintained in the legal reserve if reserves are used to increase capital. + References No definition available. + Details
Name: | san_MinimumPercentageOfIncreasedShareCapitalRequiredToBeMaintainedInLegalReserve
Namespace Prefix: | san_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of annual net profit required to be transferred to the legal reserve under the Consolidated Spanish Limited Liability companies Law. + References No definition available. + Details
Name: | san_PercentageOfAnnualNetProfitRequiredToBeTransferredToLegalReserve
Namespace Prefix: | san_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of share capital required to be maintained in the legal reserve before annual required transfers can be discontinued. + References No definition available. + Details
Name: | san_PercentageOfShareCapitalRequiredToBeMaintainedInLegalReserve
Namespace Prefix: | san_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration