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Legal proceedings - Additional information (Details)
€ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2025
lawsuit
Apr. 30, 2024
director
Mar. 31, 2024
claimant
Jan. 31, 2024
appeal
Sep. 30, 2022
EUR (€)
Dec. 31, 2024
EUR (€)
classAction
Dec. 31, 2021
EUR (€)
Disclosure of Legal Proceedings [line items]              
Damages claimed           € 587  
Number of former directors of Payvision issued a penalty order | director   2          
Number of appeals filed by client | appeal       1      
Number of claimants dissolved | claimant     1        
Conclusion Of Litigation              
Disclosure of Legal Proceedings [line items]              
Lawsuit in favor of ING | lawsuit 3            
Spain              
Disclosure of Legal Proceedings [line items]              
Class actions filed | classAction           3  
Class actions where agreement was reached | classAction           1  
Certain consumer credit products              
Disclosure of Legal Proceedings [line items]              
Legal proceedings provision             € 180
Increase in legal proceedings provision         € 75