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Financial assets at fair value through other comprehensive income - Additional information (Details) - EUR (€) € in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2024 | Dec. 31, 2023
- Financial assets at fair value through other comprehensive income |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Exchange rate differences | € 273 | € 651
Investment in Bank of Beijing |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Ownership interest held in equity based investments | 13.00% | 13.00%
Investment in Bank of Beijing | - Financial assets at fair value through other comprehensive income |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Exchange rate differences | € 14 | € (100)
Negative revaluation | € 463 | € 77

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