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Segments - Additional information (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of operating segments [line items]      
Total income € 21,087 € 18,121 € 30,418
Impairments 35 5 192
Net Results IFRS-EU | Segments banking activities      
Disclosure of operating segments [line items]      
Total income 22,615 22,575 18,561
Operating expenses 12,121 11,564 11,199
Net Results IFRS-EU | Segments banking activities | Corporate Line      
Disclosure of operating segments [line items]      
Total income 378 450 84
Hyperinflationary accounting, income (117) (179)  
Total income excl hyperinflationary impacts 134    
Impairments 53    
Operating expenses € 533 542 € 535
Decrease in operating expenses (in percent) 1.70%    
Hyperinflationary accounting, net profit (loss) € 35 48  
Hyperinflation impact, restructuring costs 25    
Hyperinflation impact, one-off CLA payment to staff 22    
Provision for hyperinflationary impact € 21 € 51