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Fair value of assets and liabilities - Summary of valuation adjustment (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Total Valuation Adjustments € 1,012 € 1,806 € (6,002)
Deferred Day One Profit or Loss      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Total Valuation Adjustments (94) (90)  
Own credit adjustments      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Total Valuation Adjustments (17) 34  
Bid/Offer      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Total Valuation Adjustments (130) (154)  
Model Risk      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Total Valuation Adjustments (33) (26)  
CVA      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Total Valuation Adjustments (123) (131)  
DVA      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Total Valuation Adjustments 50 55  
CollVA      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Total Valuation Adjustments (3) (4)  
FVA      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Total Valuation Adjustments (64) (68)  
Other valuation adjustments      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Total Valuation Adjustments 2 0  
Total Valuation Adjustments      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Total Valuation Adjustments € (412) € (385)