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Net interest income - Additional information (Details) - EUR (€)
€ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Net interest income disclosure [line Items]    
Interest expense on deposits3 € 7,462 € 5,132
TLTRO II    
Net interest income disclosure [line Items]    
Interest expense on deposits3 59 436
EU IAS 39 Carve-Out    
Net interest income disclosure [line Items]    
Increase (decrease) of net interest income 107 € 129
Without EU IAS 39 Carve-Out    
Net interest income disclosure [line Items]    
Increase (decrease) of net interest income € (418)