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Financial assets at fair value through profit or loss - Additional information (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Financial assets at fair value through profit or loss    
Financial assets held for trading € 6,487 € 6,301
Financial assets at fair value through profit or loss    
Financial assets at fair value through profit or loss    
Fair value 8,251  
Financial assets at fair value through profit or loss | Level 1    
Financial assets at fair value through profit or loss    
Fair value 4,749  
Financial assets at fair value through profit or loss | Level 2    
Financial assets at fair value through profit or loss    
Fair value 3,502  
Financial assets held for trading    
Financial assets at fair value through profit or loss    
Fair value 6,487  
Financial assets held for trading | Quoted bonds issued by sovereign states    
Financial assets at fair value through profit or loss    
Fair value 1,244  
Financial assets held for trading | Quoted bonds issued by sovereign states | Fixed rate    
Financial assets at fair value through profit or loss    
Fair value 1,030  
Financial assets held for trading | Quoted bonds issued by sovereign states | Fixed rate | Other    
Financial assets at fair value through profit or loss    
Fair value 147  
Individual amount limit to be included in other related parties 50  
Securities lending    
Financial assets at fair value through profit or loss    
Financial assets held for trading € 1,090 € 1,398