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Non-current assets held for sale and liabilities associated with non-current assets held for sale - Narrative (Details) - Assets and liabilities classified as held for sale - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Assets And Liabilities Classified As Held For Sale [Line Items] |  |  |
Provision recognised for non-current assets held for sale | € 2,357 | € 2,606 | € 2,956
Net charges recorded against valuation allowances | 131 | 163 | 139
Recoveries | 59 | € 71 | € 88
Santander Bank Polska S.A. |  |  |
Assets And Liabilities Classified As Held For Sale [Line Items] |  |  |
Remeasurement of disposal group or assets held for sale, write-off | € 2,339 |  |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Charges for the period against the valuation allowance for non-current assets held for sale. + References No definition available. + Details
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- Definition The amount of recoveries during the period for the valuation allowance for noncurrent assets held for sale. + References No definition available. + Details
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- Definition Provision Recognised For Non-Current Assets Held For Sale, Tangible Assets + References No definition available. + Details
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- Definition Remeasurement of Disposal Group or Assets Held for Sale, Write-off + References No definition available. + Details
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- Details
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- Details
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