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Hedging derivatives - Narrative (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of detailed information about hedges [abstract] |  |  |
Macro cash flows hedge, position | € 5,000 |  |
Accumulated fair value hedge adjustment remaining in statement of financial position for hedged item that ceased to be adjusted for hedging gains and losses, assets | € 227 | € 775 | € 1,006

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- Definition The accumulated amount of fair value hedge adjustment remaining in the statement of financial position for a hedged item that is a financial asset measured at amortised cost and has ceased to be adjusted for hedging gains and losses. [Refer: Financial assets at amortised cost; Hedged items [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24B -Subparagraph a -Clause v -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24B_a_v&doctype=Standard -URIDate 2025-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | ifrs-full_DisclosureOfHedgeAccountingAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Macro Cash Flows Hedge, Hedged Position + References No definition available. + Details
Name: | san_MacroCashFlowsHedgeHedgedPosition
Namespace Prefix: | san_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant