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Fair value of assets and liabilities - Summary of valuation adjustment (Details) - EUR (€)
€ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
– Revaluations € (80) € 87  
Deferred Day One Profit or Loss      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
– Revaluations (105)   € (90)
Own credit adjustments      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
– Revaluations 18   34
Bid/Offer      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
– Revaluations (135)   (154)
Model Risk      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
– Revaluations (27)   (26)
CVA      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
– Revaluations (116)   (131)
DVA      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
– Revaluations 54   55
CollVA      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
– Revaluations (3)   (4)
FVA      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
– Revaluations (52)   (68)
Total Valuation Adjustments      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
– Revaluations € (366)   € (385)