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v3.26.1

Remuneration and other benefits paid to the Bank’s directors and senior managers - Post-employment and other long-term benefits (Details) | 12 Months Ended
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Dec. 31, 2025 variable_remuneration
Disclosure of transactions between related parties [line items] |
Period for investment in bank shares from date of termination | 5 years
Directors |
Disclosure of transactions between related parties [line items] |
Pensionable base, expressed as a percent of fixed remuneration | 22.00%
Pensionable base, percent of average last three variable renumeration amounts used in determination | 30.00%
Pensionable base, number of variable renumeration amounts used in determination | 3

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage of fixed remuneration paid out in the event of death or disability of plan participants. + References No definition available. + Details
Name: | san_DefinedBenefitObligationPensionableBaseDeathOrDisabilityPercentage
Namespace Prefix: | san_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Defined Benefit Obligation, Pensionable Base, Number Of Variable Remuneration Amounts + References No definition available. + Details
Name: | san_DefinedBenefitObligationPensionableBaseNumberOfVariableRemunerationAmounts
Namespace Prefix: | san_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Defined Benefit Obligation, Pensionable Base, Percent Average Of Last Three Variable Remuneration Amounts + References No definition available. + Details
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Namespace Prefix: | san_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The period of investment in bank shares from date of termination. + References No definition available. + Details
Name: | san_PeriodForInvestmentInBankSharesFromDateOfTermination
Namespace Prefix: | san_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=srt_DirectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |