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v3.26.1

Liabilities under insurance contracts - Narrative (Details) | 12 Months Ended
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Dec. 31, 2025
Maximum |
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] |
Insured capital of premium contributed, percentage received by beneficiaries | 102.00%
Minimum |
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] |
Insured capital of premium contributed, percentage received by beneficiaries | 101.00%

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

X
- Definition Insured Capital of Premium Contributed, Percentage Received by Beneficiaries + References No definition available. + Details
Name: | san_InsuredCapitalOfPremiumContributedPercentageReceivedByBeneficiaries
Namespace Prefix: | san_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |