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Legal proceedings - Additional information (Details)
€ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2024
lawsuit
Apr. 30, 2024
appeal
director
Mar. 31, 2024
claimant
Sep. 30, 2022
EUR (€)
Jun. 30, 2024
EUR (€)
classAction
Dec. 31, 2021
EUR (€)
Disclosure of Legal Proceedings [line items]            
Damages claimed in litigation case         € 587  
Number of former directors of Payvision issued a penalty order | director   2        
Number of appeals filed by client | appeal   1        
Number of class actions | classAction         3  
Number of claimants dissolved | claimant     1      
Conclusion of litigation            
Disclosure of Legal Proceedings [line items]            
Lawsuit in favor of ING | lawsuit 1          
SPAIN            
Disclosure of Legal Proceedings [line items]            
Number of class actions, agreement reached | classAction         1  
Certain consumer credit products            
Disclosure of Legal Proceedings [line items]            
Legal proceedings provision           € 180
Increase in legal proceedings provision       € 75