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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
Jun. 30, 2024
Dec. 31, 2023
Disclosure of financial assets [line Items]    
Financial assets at fair value through other comprehensive income € 46,343 € 41,116
Equity securities    
Disclosure of financial assets [line Items]    
Financial assets at fair value through other comprehensive income 2,364 1,885
Debt securities    
Disclosure of financial assets [line Items]    
Financial assets at fair value through other comprehensive income 42,647 38,281
Debt securities | - Financial assets at fair value through other comprehensive income    
Disclosure of financial assets [line Items]    
Loan loss provisions (9) (13)
Loans and advances    
Disclosure of financial assets [line Items]    
Financial assets at fair value through other comprehensive income 1,331 951
Loans and advances | - Financial assets at fair value through other comprehensive income    
Disclosure of financial assets [line Items]    
Loan loss provisions € (4) € (8)