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Subsequent events (Details)
€ in Billions
12 Months Ended
Mar. 02, 2025
Jan. 28, 2025
EUR (€)
Dec. 31, 2024
Van Lanschot Kempen N.V      
Disclosure of non-adjusting events after reporting period [line items]      
Principal investments in associates     2.70%
Disposal of major subsidiary | Russia      
Disclosure of non-adjusting events after reporting period [line items]      
Negative impact of disposal of group post tax   € 0.7  
Disposal of major subsidiary | Russia | Forecast      
Disclosure of non-adjusting events after reporting period [line items]      
Transaction result   0.4  
Reclassification adjustments on exchange differences on translation of foreign operations, net of tax   € 0.3  
Acquisition of Associate | Van Lanschot Kempen N.V      
Disclosure of non-adjusting events after reporting period [line items]      
Percentage of ownership interest acquired 0.072    
Acquisition of Associate | Forecast | Van Lanschot Kempen N.V      
Disclosure of non-adjusting events after reporting period [line items]      
Percentage of ownership interest acquired 0.176    
Interest held 20.30%