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Transfer of financial assets, assets pledged and received as collateral - Schedule of transfer of financial assets not qualifying for derecognition (Details) - EUR (€) € in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Sale and repurchase, equity |  |
Disclosure of transferred financial assets that are not derecognised in their entirety [line items] |  |
Associated liabilities at carrying amount | € 11,010 | € 6,245
Sale and repurchase, debt |  |
Disclosure of transferred financial assets that are not derecognised in their entirety [line items] |  |
Associated liabilities at carrying amount | 9,467 | 8,932
Financial assets at fair value through profit or loss | Securities lending, equity |  |
Disclosure of transferred financial assets that are not derecognised in their entirety [line items] |  |
Transferred assets at carrying amount | 3,894 | 2,087
Financial assets at fair value through profit or loss | Sale and repurchase, equity |  |
Disclosure of transferred financial assets that are not derecognised in their entirety [line items] |  |
Transferred assets at carrying amount | 7,357 | 6,357
Financial assets at fair value through profit or loss | Sale and repurchase, debt |  |
Disclosure of transferred financial assets that are not derecognised in their entirety [line items] |  |
Transferred assets at carrying amount | 11,780 | 7,178
Financial assets at FVOCI | Securities lending, debt |  |
Disclosure of transferred financial assets that are not derecognised in their entirety [line items] |  |
Transferred assets at carrying amount | 328 | 499
Financial assets at FVOCI | Sale and repurchase, debt |  |
Disclosure of transferred financial assets that are not derecognised in their entirety [line items] |  |
Transferred assets at carrying amount | 470 | 453
Loans and advances to customers | Sale and repurchase, debt |  |
Disclosure of transferred financial assets that are not derecognised in their entirety [line items] |  |
Transferred assets at carrying amount | 2,396 | 4,637
Securities at amortised cost | Securities lending, debt |  |
Disclosure of transferred financial assets that are not derecognised in their entirety [line items] |  |
Transferred assets at carrying amount | 431 | 435
Securities at amortised cost | Sale and repurchase, debt |  |
Disclosure of transferred financial assets that are not derecognised in their entirety [line items] |  |
Transferred assets at carrying amount | € 465 | € 261

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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 fair value of transferred financial assets that are not derecognised in their entirety. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 42D -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_42D_d&doctype=Standard -URIDate 2023-03-23 + Details
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