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Risk management - Most important foreign exchange year-end trading positions (Details) - Foreign exchange - Trading portfolios, netting - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
US Dollar    
Market Risk [Line Items]    
Reportable ECL € (93)  
Turkish Lira    
Market Risk [Line Items]    
Reportable ECL 84  
Korean Won    
Market Risk [Line Items]    
Reportable ECL 62  
Japan, Yen    
Market Risk [Line Items]    
Reportable ECL 61 € 61
Chinese Yuan    
Market Risk [Line Items]    
Reportable ECL € (37) 49
Taiwan, New Dollars    
Market Risk [Line Items]    
Reportable ECL   (58)
Romanian Leu    
Market Risk [Line Items]    
Reportable ECL   58
Hong Kong Dollar    
Market Risk [Line Items]    
Reportable ECL   € (38)