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Valuation results and net trading income - Additional information (Details) - – Trading securities - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Valuation Results And Net Trading Income [Line Items] |  |  |
Impact of interest rate volatility, EU IAS39 carve out adjustment | € (1,793) | € (4,642) | € 10,713
Trading assets |  |  |
Valuation Results And Net Trading Income [Line Items] |  |  |
Gains (losses) on financial assets at fair value through profit or loss | € 20 | € 160 | € (157)

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- Definition The gains (losses) on financial assets at fair value through profit or loss. [Refer: Financial assets at fair value through profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 20 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_20_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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