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Net interest income - Additional information (Details)
€ in Millions
 1 Months Ended 5 Months Ended 8 Months Ended 12 Months Ended 18 Months Ended
Mar. 22, 2023
Feb. 08, 2023
Dec. 31, 2022
Dec. 21, 2022
Nov. 22, 2022
Dec. 31, 2023
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Jun. 23, 2022
Net Interest Income Disclosure [Line Items]                    
Net interest income             € 16,162 € 14,593 € 14,000  
ECB funding rate benefit on TLTRO II programme               314 € 808  
Interest paid, TLTRO III             557      
Funding rate, TLTRO III 0.0300 0.0250 0.0200 0.0150   0.0400       (0.0100)
Funding rate, TLTRO III, series 3         (0.0037)          
Funding rate, TLTRO III, series 4         (0.0036)          
Funding rate, TLTRO III, series 7         (0.0029)          
Poland                    
Net Interest Income Disclosure [Line Items]                    
Net interest income             (343)      
EU IAS 39 carve-out                    
Net Interest Income Disclosure [Line Items]                    
Increase (decrease) of net interest income             187 € 836    
Without EU IAS 39 carve-out                    
Net Interest Income Disclosure [Line Items]                    
Increase (decrease) of net interest income             € 1,382