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Net interest income - Additional information (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Net Interest Income Disclosure [Line Items]      
Interest income (expense) € (15,288) € (16,162) € (14,593)
ECB funding rate benefit on TLTRO III programme     314
Interest paid, TLTRO III 15,105 11,940 3,506
EU IAS 39 carve-out      
Net Interest Income Disclosure [Line Items]      
Increase (decrease) of net interest income 265 187 836
Without EU IAS 39 carve-out      
Net Interest Income Disclosure [Line Items]      
Increase (decrease) of net interest income (609)    
TLTRO III      
Net Interest Income Disclosure [Line Items]      
Interest paid, TLTRO III € 59 € 557  
Poland      
Net Interest Income Disclosure [Line Items]      
Interest income (expense)     € (343)