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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
--- | --- | --- | --- | ---
Mar. 01, 2025 | Feb. 28, 2025 | Jun. 30, 2025 | Dec. 31, 2024
Financial assets at FVOCI |  |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |  |
Exchange rate differences |  |  | € (1,385) | € 506
Financial assets at FVOCI | FVOCI equity securities |  |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |  |
Exchange rate differences |  |  | € (226) | € 62
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 FVOCI |  |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |  |
Recoveries of amounts previously written off |  |  | € 223 | € 590
Investment in Van Lanschot Kempen |  |  |  |
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 | 9.90% | 2.70% |  |
Percentage of ownership interest acquired | 7.20% |  |  |

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