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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
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