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Valuation results and net trading income - Additional information (Details) - EUR (€) € in Millions | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Trading securities |  |
Valuation Results And Net Trading Income [Line Items] |  |
Impact of interest rate volatility, EU IAS39 carve out adjustment | € 933 | € 1,405

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- Details
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