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Financial assets at fair value through profit or loss - Summary of non-trading derivatives (Details) - EUR (€) € in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of fair value measurement of assets [line items] |  |
Non-trading derivatives | € 2,028 | € 3,893
Non-trading derivatives | Other non-trading derivatives |  |
Disclosure of fair value measurement of assets [line items] |  |
Non-trading derivatives | 771 | 2,124
- fair value hedges | Non-trading derivatives |  |
Disclosure of fair value measurement of assets [line items] |  |
Non-trading derivatives | 716 | 836
- cash flow hedges | Non-trading derivatives |  |
Disclosure of fair value measurement of assets [line items] |  |
Non-trading derivatives | 440 | 814
- hedges of net investments in foreign operations | Non-trading derivatives |  |
Disclosure of fair value measurement of assets [line items] |  |
Non-trading derivatives | € 100 | € 119

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