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Loans and advances to customers - Schedule of the breakdown of the securitized loans (Details) - Securitized loans and loans and advances to customers - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of transferred financial assets that are not derecognised in their entirety [line items] |  |  |
Securitized loans retained on the balance sheet | € 80,072 | € 80,824 | € 75,738
Securitised mortgage assets |  |  |
Disclosure of transferred financial assets that are not derecognised in their entirety [line items] |  |  |
Securitized loans retained on the balance sheet | 19,640 | 17,782 | 16,994
Securitised mortgage assets | United Kingdom |  |  |
Disclosure of transferred financial assets that are not derecognised in their entirety [line items] |  |  |
Securitized loans retained on the balance sheet | 10,236 | 9,034 | 6,096
Other securitised assets |  |  |
Disclosure of transferred financial assets that are not derecognised in their entirety [line items] |  |  |
Securitized loans retained on the balance sheet | € 60,432 | € 63,042 | € 58,744

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