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Financial assets held for trading - Additional information (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Financial assets held for trading    
Financial assets held for trading € 5,502,000 € 6,760,000
Financial assets held for trading    
Financial assets held for trading    
Fair value 5,502,000  
Individual amount limit to be included in other related parties 50,000  
Financial assets held for trading | Level 1    
Financial assets held for trading    
Fair value 5,248,000  
Financial assets held for trading | Level 2    
Financial assets held for trading    
Fair value 254,000  
Securities lending    
Financial assets held for trading    
Financial assets held for trading € 1,361,000 € 1,347,000