XML 320 R238.htm IDEA: XBRL DOCUMENT
v3.26.1

Provisions - Schedule of defined benefit obligation expenses recognized in the consolidated income statements, United Kingdom (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Post-employment benefit expense in profit or loss, defined benefit plans | € 41 | € 45 | € 42
United Kingdom |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 9 | 13 | 14
Interest cost (net) | (31) | (40) | (62)
Provisions or reversal of provisions, net |  |  |
Cost of services provided | 0 | 0 | 0
Others | 0 | 0 | 0
Post-employment benefit expense in profit or loss, defined benefit plans | € (22) | € (27) | € (48)

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

X
- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 5 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_5&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_135_b&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_PostemploymentBenefitExpenseDefinedBenefitPlans
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Defined Benefit Plans, Cost Of Services Provided + References No definition available. + Details
Name: | san_DefinedBenefitPlansCostOfServicesProvided
Namespace Prefix: | san_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of interest expense net recognized related to defined benefit plan. + References No definition available. + Details
Name: | san_DefinedBenefitPlansInterestExpenseNet
Namespace Prefix: | san_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Defined Benefit Plans, Others + References No definition available. + Details
Name: | san_DefinedBenefitPlansOthers
Namespace Prefix: | san_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Defined Benefit Plans, Provisions (Reversal), Net + References No definition available. + Details
Name: | san_DefinedBenefitPlansProvisionsReversalNet
Namespace Prefix: | san_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of service cost expense recognized related to defined benefit plan. + References No definition available. + Details
Name: | san_DefinedBenefitPlansServiceCost
Namespace Prefix: | san_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_GB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |