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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, 2023
Dec. 31, 2022
Japan, Yen    
Market Risk [Line Items]    
Reportable ECL € 61 € 86
Taiwan Dollar    
Market Risk [Line Items]    
Reportable ECL (58)  
Romanian Leu    
Market Risk [Line Items]    
Reportable ECL 58 88
Chinese Yuan    
Market Risk [Line Items]    
Reportable ECL 49 32
Hong Kong Dollar    
Market Risk [Line Items]    
Reportable ECL € (38)  
US Dollar    
Market Risk [Line Items]    
Reportable ECL   (187)
South Korean Won    
Market Risk [Line Items]    
Reportable ECL   € 28