- 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

Name:	ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred Variable Remuneration, Maximum Number Of Beneficiaries

+ References

No definition available.

+ Details

Name:	san_DeferredVariableRemunerationMaximumNumberOfBeneficiaries
Namespace Prefix:	san_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred Variable Remuneration, Maximum Total Amount Of Incentive

+ References

No definition available.

+ Details

Name:	san_DeferredVariableRemunerationMaximumTotalAmountOfIncentive
Namespace Prefix:	san_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Deferred Variable Remuneration, Milestone, Migration Of OpenBank And Launch, Number Of Markets

+ References

No definition available.

+ Details

Name:	san_DeferredVariableRemunerationMilestoneMigrationOfOpenBankAndLaunchNumberOfMarkets
Namespace Prefix:	san_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred Variable Remuneration, Milestone, Minimum Number Of Countries With SuperDigital, Excluding Brazil

+ References

No definition available.

+ Details

Name:	san_DeferredVariableRemunerationMilestoneMinimumNumberOfCountriesWithSuperDigitalExcludingBrazil
Namespace Prefix:	san_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred Variable Remuneration, Milestone, Number Of Countries With PagoFX Global Platform

+ References

No definition available.

+ Details

Name:	san_DeferredVariableRemunerationMilestoneNumberOfCountriesWithPagoFXGlobalPlatform
Namespace Prefix:	san_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred Variable Remuneration, Milestone, Number Of Geographies With Global Merchant Services Platform

+ References

No definition available.

+ Details

Name:	san_DeferredVariableRemunerationMilestoneNumberOfGeographiesWithGlobalMerchantServicesPlatform
Namespace Prefix:	san_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred Variable Remuneration, Milestone, Number Of Geographies With Global Platform SuperDigital

+ References

No definition available.

+ Details

Name:	san_DeferredVariableRemunerationMilestoneNumberOfGeographiesWithGlobalPlatformSuperDigital
Namespace Prefix:	san_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred Variable Remuneration, Milestone, Number Of Geographies With Global Trade Services Platform

+ References

No definition available.

+ Details

Name:	san_DeferredVariableRemunerationMilestoneNumberOfGeographiesWithGlobalTradeServicesPlatform
Namespace Prefix:	san_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred Variable Remuneration, Milestone, Number Of Priority Use Cases With Machine Learning Deployment

+ References

No definition available.

+ Details

Name:	san_DeferredVariableRemunerationMilestoneNumberOfPriorityUseCasesWithMachineLearningDeployment
Namespace Prefix:	san_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred Variable Remuneration, Milestone, Number Of Sales Programs With Conversion Rate Optimization Roll-Out

+ References

No definition available.

+ Details

Name:	san_DeferredVariableRemunerationMilestoneNumberOfSalesProgramsWithConversionRateOptimizationRollOut
Namespace Prefix:	san_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred Variable Remuneration, Milestone, One Common Mobile Experience, Maximum Number Of Active Countries

+ References

No definition available.

+ Details

Name:	san_DeferredVariableRemunerationMilestoneOneCommonMobileExperienceMaximumNumberOfActiveCountries
Namespace Prefix:	san_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred Variable Remuneration, Milestone, One Common Mobile Experience, Minimum Migratable Virtual Machines On Cloud Technology, Percentage

+ References

No definition available.

+ Details

Name:	san_DeferredVariableRemunerationMilestoneOneCommonMobileExperienceMinimumMigratableVirtualMachinesOnCloudTechnologyPercentage
Namespace Prefix:	san_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred Variable Remuneration, Milestone, One Common Mobile Experience, Minimum Number Of Active Countries

+ References

No definition available.

+ Details

Name:	san_DeferredVariableRemunerationMilestoneOneCommonMobileExperienceMinimumNumberOfActiveCountries
Namespace Prefix:	san_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred Variable Remuneration, Milestone, One Common Mobile Experience, Top Rated Entities, Mobile Net Promoter, Maximum Number Of Countries

+ References

No definition available.

+ Details

Name:	san_DeferredVariableRemunerationMilestoneOneCommonMobileExperienceTopRatedEntitiesMobileNetPromoterMaximumNumberOfCountries
Namespace Prefix:	san_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred Variable Remuneration, Milestone, One Common Mobile Experience, Top Rated Entities, Mobile Net Promoter, Minimum Number Of Countries

+ References

No definition available.

+ Details

Name:	san_DeferredVariableRemunerationMilestoneOneCommonMobileExperienceTopRatedEntitiesMobileNetPromoterMinimumNumberOfCountries
Namespace Prefix:	san_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred Variable Remuneration, Milestone, Pago Nxt, Number Of Active Customers

+ References

No definition available.

+ Details

Name:	san_DeferredVariableRemunerationMilestonePagoNxtNumberOfActiveCustomers
Namespace Prefix:	san_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred Variable Remuneration, Milestone, Pago Nxt, Number Of Countries With Superdigital Implemented

+ References

No definition available.

+ Details

Name:	san_DeferredVariableRemunerationMilestonePagoNxtNumberOfCountriesWithSuperdigitalImplemented
Namespace Prefix:	san_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred Variable Remuneration, Milestone, Pago Nxt, Number Of Customers Acquired, Percentage

+ References

No definition available.

+ Details

Name:	san_DeferredVariableRemunerationMilestonePagoNxtNumberOfCustomersAcquiredPercentage
Namespace Prefix:	san_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred Variable Remuneration, Number Of Different Blocks

+ References

No definition available.

+ Details

Name:	san_DeferredVariableRemunerationNumberOfDifferentBlocks
Namespace Prefix:	san_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Deferred Variable Remuneration, Options, Vesting Period

+ References

No definition available.

+ Details

Name:	san_DeferredVariableRemunerationOptionsVestingPeriod
Namespace Prefix:	san_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Key Management Personnel Compensation, Long Term And Deferred Compensation, Percent Of Achievement

+ References

No definition available.

+ Details

Name:	san_KeyManagementPersonnelCompensationLongTermAndDeferredCompensationPercentOfAchievement
Namespace Prefix:	san_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Key Management Personnel Compensation, Long Term And Deferred Compensation, Percent Of Total Awarded In Options Over Shares

+ References

No definition available.

+ Details

Name:	san_KeyManagementPersonnelCompensationLongTermAndDeferredCompensationPercentOfTotalAwardedInOptionsOverShares
Namespace Prefix:	san_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Key Management Personnel Compensation, Long Term And Deferred Compensation, Percent Of Total Awarded In Shares

+ References

No definition available.

+ Details

Name:	san_KeyManagementPersonnelCompensationLongTermAndDeferredCompensationPercentOfTotalAwardedInShares
Namespace Prefix:	san_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The deferral period to pay variable remuneration or bonus.

+ References

No definition available.

+ Details

Name:	san_VariableRemunerationDeferralPeriod
Namespace Prefix:	san_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=san_DigitalTransformationAwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=san_DigitalTransformationAward20202021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=san_DigitalTransformationAward2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=san_DigitalTransformationAward2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=san_DigitalTransformationAward2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=san_DigitalTransformationAward2022FirstBlockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=san_DigitalTransformationAward2022SecondBlockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=san_DigitalTransformationAward2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=san_DigitalTransformationAward2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=san_DigitalTransformationAward2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Staff costs - Schedule of deferred variable remuneration systems, digital transformation award (Details) € in Millions, customer in Millions	12 Months Ended
	Dec. 31, 2025 EUR (€) people country customer geographies case salesProgram market	Dec. 31, 2024 EUR (€) people	Dec. 31, 2023	Dec. 31, 2022 EUR (€) block people	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based payment arrangement
Deferral period	5 years
Total achievement of incentive							83.00%
Digital Transformation Award
Share-based payment arrangement
Maximum number of beneficiaries \| people	250
Maximum amount of incentive \| €	€ 30
Number of markets with OpenBank \| market	3
Minimum number of countries with SuperDigital, excluding Brazil \| country	1
Percent awarded in shares	50.00%
Percent awarded in options over shares	50.00%
Options, vesting period	10 years
Total achievement of incentive						85.00%
Digital Transformation Award \| Minimum
Share-based payment arrangement
Deferral period	3 years
Total achievement of incentive					77.50%
Digital Transformation Award \| Maximum
Share-based payment arrangement
Deferral period	5 years
Digital Transformation Award 2020 & 2021
Share-based payment arrangement
Options, vesting period	8 years
Digital Transformation Award 2020
Share-based payment arrangement
Number of geographies with global merchant services platform \| geographies	3
Number of geographies with global trade services platform \| geographies	8
Number of geographies with global platform SuperDigital \| country	4
Number of priority use cases with machine learning deployment \| case	4
Number of sales programs with conversion rate optimization roll-out \| salesProgram	40
Number of countries with PagoFX global platform \| country	4
Digital Transformation Award 2021
Share-based payment arrangement
Number of countries with Superdigital implemented \| country	7
Number of active customers using Pago Nxt \| customer	1.5
Number of customers acquired in Pago Nxt (in percentage)	50.00%
Minimum number of active countries with One Common Mobile Experience \| country	3
Maximum number of active countries with One Common Mobile Experience \| country	4
Minimum number of countries with One Common Mobile Experience as top three rated entity \| country	2
Maximum number of countries with One Common Mobile Experience as top three rated entity \| country	4
Minimum migratable virtual machines on cloud technology (in percentage)	75.00%
Digital Transformation Award 2022
Share-based payment arrangement
Maximum number of beneficiaries \| people				50
Maximum amount of incentive \| €				€ 15
Number of different blocks \| block				2
Digital Transformation Award 2022, first block
Share-based payment arrangement
Maximum number of beneficiaries \| people				250
Maximum amount of incentive \| €				€ 30
Percent awarded in shares				50.00%
Percent awarded in options over shares				50.00%
Options, vesting period				10 years
Total achievement of incentive				96.50%
Digital Transformation Award 2022, first block \| Minimum
Share-based payment arrangement
Deferral period				3 years
Digital Transformation Award 2022, first block \| Maximum
Share-based payment arrangement
Deferral period				5 years
Digital Transformation Award 2022, second block
Share-based payment arrangement
Total achievement of incentive				100.00%
Digital Transformation Award 2023
Share-based payment arrangement
Maximum number of beneficiaries \| people		50
Maximum amount of incentive \| €		€ 15
Total achievement of incentive			88.00%
Digital Transformation Award 2024
Share-based payment arrangement
Total achievement of incentive	77.00%
Digital Transformation Award 2024 \| Minimum
Share-based payment arrangement
Maximum number of beneficiaries \| people	50
Digital Transformation Award 2024 \| Maximum
Share-based payment arrangement
Maximum number of beneficiaries \| people	60
Digital Transformation Award 2025
Share-based payment arrangement
Total achievement of incentive	85.00%
Digital Transformation Award 2025 \| Minimum
Share-based payment arrangement
Maximum number of beneficiaries \| people	50
Digital Transformation Award 2025 \| Maximum
Share-based payment arrangement
Maximum number of beneficiaries \| people	60