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Net interest income - Additional information (Details) - EUR (€) € in Millions | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
EU IAS 39 carve-out |  |
Net Interest Income Disclosure [Line Items] |  |
Increase (decrease) of net interest income | € 131 | € 107
Without EU IAS 39 carve-out |  |
Net Interest Income Disclosure [Line Items] |  |
Increase (decrease) of net interest income | € (496) |

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- Details
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