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Provisions - Litigation and other matters - Tax Litigation Narrative (Details) € in Millions | Dec. 31, 2025 EUR (€) | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€) | Jun. 13, 2023 case | Dec. 31, 2022 EUR (€)
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Disclosure of other provisions [line items] |  |  |  |  |
PROVISIONS | € 8,355 | € 8,407 | € 8,441 |  | € 8,149
Banco Santander (Brasil) S.A. |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |
Legal proceedings provision, probable loss fully provisioned | 553 |  |  |  |
Banco Santander Brasil Sa Subsidiary |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |
Legal proceedings provision, possible loss, contingent liabilities | 5,040 |  |  |  |
Legal Case Relating To Programa de Integraçao Social And Contribuição para Financiamento da Seguridade Social |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |
Number of unfavorably cases ruled by federal supreme court | case |  |  |  | 2 |
Legal case relating to questionable deduction of loan losses in income tax returns | Banco Santander Brazil SA Subsidiary |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |
PROVISIONS | 0 |  |  |  |
Legal Case Relating To Tax Deductibility Of Sale Of Shares | Banco Santander Brazil SA Subsidiary |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |
PROVISIONS | 0 |  |  |  |
Legal case relating to deduction of expenses in income tax | Banco Santander (Brasil) S.A. |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |
PROVISIONS | 0 |  |  |  |
Legal case related to tax deductibility of amortization of goodwill arising on acquisition | Banco Santander Brazil SA Subsidiary | Banco Comercial e de Investimento Sudameris S.A |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |
PROVISIONS | 0 |  |  |  |
Legal case related to tax deductibility of amortization of goodwill arising on acquisition | Banco Santander Brazil SA Subsidiary | Getnet Tecnologia Proces S.A. |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |
PROVISIONS | 0 |  |  |  |
Legal Case Related To Tax Compensation With Credits | Banco Santander Brazil SA Subsidiary |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |
PROVISIONS | 0 |  |  |  |
Legal case related to infringement notices initiated by tax authorities regarding the offsetting of tax losses | Banco Santander Brazil SA Subsidiary |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |
PROVISIONS | 0 |  |  |  |
Legal case related to withholding income tax on payments derived from technology services | Banco Santander (Brasil) S.A. |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |
PROVISIONS | € 0 |  |  |  |

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