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Fair value of assets and liabilities - Summary of valuation adjustment (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Total Valuation Adjustments € 1,806 € (6,002) € (1,321)
Deferred Day One Profit or Loss      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Total Valuation Adjustments (90) (108)  
Own credit adjustments      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Total Valuation Adjustments 34 75  
Bid/Offer      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Total Valuation Adjustments (154) (216)  
Model Risk      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Total Valuation Adjustments (26) (13)  
CVA      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Total Valuation Adjustments (131) (192)  
DVA      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Total Valuation Adjustments 55 99  
CollVA      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Total Valuation Adjustments (4) (8)  
FVA      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Total Valuation Adjustments (68) (78)  
Total Valuation Adjustments      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Total Valuation Adjustments € (385) € (441)