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Financial assets at fair value through profit or loss - Summary of non-trading derivatives (Details) - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of fair value measurement of assets [line items] |  |
Non-trading derivatives | € 2,463 | € 2,028
Non-trading derivatives | Other non-trading derivatives |  |
Disclosure of fair value measurement of assets [line items] |  |
Non-trading derivatives | 1,606 | 771
- fair value hedges | Non-trading derivatives |  |
Disclosure of fair value measurement of assets [line items] |  |
Non-trading derivatives | 617 | 716
- cash flow hedges | Non-trading derivatives |  |
Disclosure of fair value measurement of assets [line items] |  |
Non-trading derivatives | 158 | 440
- hedges of net investments in foreign operations | Non-trading derivatives |  |
Disclosure of fair value measurement of assets [line items] |  |
Non-trading derivatives | € 82 | € 100

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