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Financial assets at fair value through other comprehensive income - Summary of financial assets at fair value through other comprehensive income (Details) - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of financial assets [line items] |  |
Financial assets at fair value through other comprehensive income | € 46,389 | € 41,116
Equity securities |  |
Disclosure of financial assets [line items] |  |
Financial assets at fair value through other comprehensive income | 2,562 | 1,885
- Debt securities |  |
Disclosure of financial assets [line items] |  |
Financial assets at fair value through other comprehensive income | 42,219 | 38,281
- Debt securities | Financial assets at FVOCI | Accumulated impairments |  |
Disclosure of financial assets [line items] |  |
Financial assets at fair value through other comprehensive income | 12 | 13
Loans and receivables |  |
Disclosure of financial assets [line items] |  |
Financial assets at fair value through other comprehensive income | 1,608 | 951
Loans and receivables | Financial assets at FVOCI | Accumulated impairments |  |
Disclosure of financial assets [line items] |  |
Financial assets at fair value through other comprehensive income | € 7 | € 8

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