XML 311 R229.htm IDEA: XBRL DOCUMENT
v3.26.1

Provisions - Disclosure of expected rate of return assumptions (Details) - Spain | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Post-employment plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Expected rate of return on plan assets | 3.75% | 3.00% | 3.35%
Expected rate of return on reimbursement rights | 3.75% | 3.00% | 3.35%
Other long term employee benefits |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Expected rate of return on plan assets | 3.75% | 3.00% | 3.35%

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
- Definition Expected rate of return on plan assets. + References No definition available. + Details
Name: | san_ExpectedRateOfReturnOnPlanAssets
Namespace Prefix: | san_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Expected rate of return on reimbursement rights for insurance contract linked to defined benefit plan. + References No definition available. + Details
Name: | san_InsuranceContractLinkedToDefinedBenefitPlansExpectedRateOfReturnOnReimbursementRights
Namespace Prefix: | san_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=san_PensionsAndOtherEmploymentDefinedBenefitObligationsProvisionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=san_OtherLongTermEmployeeBenefitsProvisionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |