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Additional disclosures - Schedule of preferred shares and securities (Details) - Financial liabilities at amortised cost - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |
Outstanding issue amount | € 29,287 | € 35,813 | € 30,912 | € 25,926
Subordinated debt |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |
Outstanding issue amount | 10,304 | 10,032 | 9,283 |
Subordinated liabilities, preference shares |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |
Outstanding issue amount | 201 | 211 | 202 |
Subordinated liabilities, preferred securities |  |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |  |
Outstanding issue amount | € 10,103 | € 9,821 | € 9,081 |

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