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Off balance sheet commitments - Summary of Amount of Guarantees Given and Received (Details) - EUR (€) € in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Guarantees received |  |  |
Disclosure of Guarantees [Line Items] |  |  |
Estimated financial effect of contingent liabilities | € 1,272 | € 1,229 | € 1,149
Guarantees given |  |  |
Disclosure of Guarantees [Line Items] |  |  |
Estimated financial effect of contingent liabilities | 3,936 | 3,815 | 3,794
Guarantees provided to banks in connection with credit facilities |  |  |
Disclosure of Guarantees [Line Items] |  |  |
Estimated financial effect of contingent liabilities | 1,067 | 1,007 | 1,042
Other guarantees given |  |  |
Disclosure of Guarantees [Line Items] |  |  |
Estimated financial effect of contingent liabilities | € 2,869 | € 2,808 | € 2,752

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- Definition The amount of the estimated financial effect of contingent liabilities. [Refer: Contingent liabilities [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2023-01-01 -Paragraph 86 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_86_a&doctype=Standard -URIDate 2023-03-23 + Details
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