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Financial liabilities at fair value through profit or loss - Summary of designated as at fair value through profit or loss by type (Details) - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of fair value measurement of liabilities [line items] |  |
Designated at fair value through profit or loss | € 49,543 | € 55,400
Funds entrusted |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Designated at fair value through profit or loss | 39,577 | 46,633
Subordinated liabilities |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Designated at fair value through profit or loss | 122 | 95
- Debt securities |  |
Disclosure of fair value measurement of liabilities [line items] |  |
Designated at fair value through profit or loss | € 9,844 | € 8,672

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of financial liabilities at fair value through profit or loss that were designated as such upon initial recognition or subsequently. [Refer: At fair value [member]; Financial liabilities 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 8 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_8_e&doctype=Standard -URIDate 2024-03-27 + Details
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