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Financial assets held for trading - Additional information (Details) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Financial assets held for trading    
Financial assets held for trading € 6,760 € 6,552
Financial assets held for trading    
Financial assets held for trading    
Fair value 6,760  
Financial assets held for trading | Maximum    
Financial assets held for trading    
Value limit for inclusion in other category 50  
Financial assets held for trading | Level 1    
Financial assets held for trading    
Fair value 6,219  
Financial assets held for trading | Level 2    
Financial assets held for trading    
Fair value 541  
Securities lending    
Financial assets held for trading    
Financial assets held for trading € 1,347 € 1,301