Valuation results and net trading income - Additional information (Details) - – Trading securities - EUR (€) € in Millions	12 Months Ended
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)

The gains (losses) on financial assets at fair value through profit or loss. [Refer: Financial assets at fair value through profit or loss]

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

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