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Debt securities - Summary of exposure to debt securities (Details) - EUR (€)
€ in Millions
Jun. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Debt securities      
Disclosure of financial assets [line Items]      
Financial assets € 107,048 € 98,864  
Debt Securities at FVOCI      
Disclosure of financial assets [line Items]      
Financial assets 46,343 41,116 € 31,625
Debt Securities at FVOCI | Debt securities      
Disclosure of financial assets [line Items]      
Financial assets 42,647 38,281  
Debt Securities at AC | Debt securities      
Disclosure of financial assets [line Items]      
Financial assets 49,537 48,313  
Debt securities at fair value through other comprehensive income and amortised cost | Debt securities      
Disclosure of financial assets [line Items]      
Financial assets 92,184 86,594  
Trading assets | Debt securities      
Disclosure of financial assets [line Items]      
Financial assets 9,952 6,907  
Debt securities designated and measured at fair value through profit or loss | Debt securities      
Disclosure of financial assets [line Items]      
Financial assets 4,058 4,470  
Debt securities mandatorily measured at fair value through profit or loss | Debt securities      
Disclosure of financial assets [line Items]      
Financial assets 854 894  
Total debt securities at fair value through profit or loss | Debt securities      
Disclosure of financial assets [line Items]      
Financial assets € 14,864 € 12,270