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Risk management - Most important foreign exchange year-end trading positions (Details) - Foreign exchange - Trading portfolios, netting - EUR (€) € in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Japan, Yen |  |
Market Risk [Line Items] |  |
Reportable ECL | € 61 | € 86
Taiwan Dollar |  |
Market Risk [Line Items] |  |
Reportable ECL | (58) |
Romanian Leu |  |
Market Risk [Line Items] |  |
Reportable ECL | 58 | 88
Chinese Yuan |  |
Market Risk [Line Items] |  |
Reportable ECL | 49 | 32
Hong Kong Dollar |  |
Market Risk [Line Items] |  |
Reportable ECL | € (38) |
US Dollar |  |
Market Risk [Line Items] |  |
Reportable ECL |  | (187)
South Korean Won |  |
Market Risk [Line Items] |  |
Reportable ECL |  | € 28

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- Definition The measure of a potential loss exposure as a result of future market movements, based on a specified confidence interval and measurement horizon. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 41 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_41&doctype=Standard -URIDate 2023-03-23 + Details
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