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v3.26.1

Risk management - Schedule of weights used for current political and economic positions, by entity (Details) | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Pessimistic scenario 3 | Santander UK plc |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of weightings associated with the macroeconomic scenarios |  | 20.00% | 20.00%
Pessimistic scenario 2 | Santander UK plc |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of weightings associated with the macroeconomic scenarios | 10.00% | 10.00% | 10.00%
Pessimistic scenario 2 | Santander Bank, National Association | US | Total North America |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of weightings associated with the macroeconomic scenarios | 18.00% | 18.00% | 18.00%
Pessimistic scenario 2 | Santander Consumer USA Holdings Inc. | US | Total North America |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of weightings associated with the macroeconomic scenarios | 18.00% | 18.00% | 18.00%
Pessimistic scenario 1 | Santander UK plc |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of weightings associated with the macroeconomic scenarios | 25.00% | 25.00% | 10.00%
Pessimistic scenario 1 | Santander Bank, National Association | US | Total North America |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of weightings associated with the macroeconomic scenarios | 20.00% | 20.00% | 20.00%
Pessimistic scenario 1 | Santander Consumer USA Holdings Inc. | US | Total North America |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of weightings associated with the macroeconomic scenarios | 20.00% | 20.00% | 20.00%
Base scenario | Spain |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of weightings associated with the macroeconomic scenarios | 40.00% | 40.00% | 40.00%
Base scenario | Santander UK plc |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of weightings associated with the macroeconomic scenarios | 50.00% | 50.00% | 50.00%
Base scenario | Santander Bank, National Association | US | Total North America |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of weightings associated with the macroeconomic scenarios | 33.00% | 33.00% | 33.00%
Base scenario | Santander Consumer USA Holdings Inc. | US | Total North America |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of weightings associated with the macroeconomic scenarios | 33.00% | 33.00% | 33.00%
Base scenario | Banco Santander (Brasil) S.A. | Brazil | Total South America |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of weightings associated with the macroeconomic scenarios | 75.00% | 75.00% | 80.00%
Optimistic scenario | Santander UK plc |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of weightings associated with the macroeconomic scenarios | 15.00% | 15.00% | 10.00%
Optimistic scenario | Santander Bank, National Association | US | Total North America |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of weightings associated with the macroeconomic scenarios | 30.00% | 30.00% | 30.00%
Optimistic scenario | Santander Consumer USA Holdings Inc. | US | Total North America |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of weightings associated with the macroeconomic scenarios | 30.00% | 30.00% | 30.00%
Optimistic scenario | Banco Santander (Brasil) S.A. | Brazil | Total South America |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of weightings associated with the macroeconomic scenarios | 13.00% | 13.00% | 10.00%
Pessimistic scenario | Spain |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of weightings associated with the macroeconomic scenarios | 30.00% | 30.00% | 30.00%
Pessimistic scenario | Banco Santander (Brasil) S.A. | Brazil | Total South America |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of weightings associated with the macroeconomic scenarios | 13.00% | 13.00% | 10.00%
Optimistic scenario 1 | Spain |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of weightings associated with the macroeconomic scenarios | 30.00% | 30.00% | 30.00%

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