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Financial assets at fair value through other comprehensive income - Additional information (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
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 | € 506 | € 651
Disposals and redemptions | 16,907 | 11,913
Additions | 21,091 | 19,995
Changes in unrealised revaluations | 509 | 725
Financial assets at FVOCI | - Debt securities |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Changes in unrealised revaluations | (96) | 657
Financial assets at 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 | 62 | (100)
Disposals and redemptions | 1 | 2
Additions | 11 | 28
Changes in unrealised revaluations | € 605 | € 68
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] |  |
Negative revaluation | € 590 | € 77
NNHB Equity Instruments | Financial assets at FVOCI | - Equity securities |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Disposals and redemptions | € 263 |

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