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Subordinated loans - Additional information (Details)
€ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2024
EUR (€)
Apr. 30, 2024
USD ($)
Feb. 29, 2024
EUR (€)
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Sep. 30, 2024
USD ($)
Aug. 31, 2024
EUR (€)
May 31, 2024
EUR (€)
Feb. 29, 2024
USD ($)
Disclosure of detailed information about borrowings [line items]                    
Subordinated loans       € 17,878 € 15,401          
Redemption of subordinated loans [1]       € 113,014 € 90,574 € 82,844        
8% Perpetual AT1 Contingent Convertible Capital Securities (USD)                    
Disclosure of detailed information about borrowings [line items]                    
Subordinated loans | $                   $ 1,250
Borrowings, interest rate                   8.00%
4.38% Fixed Rate Subordinated Tier 2 Notes (EUR)                    
Disclosure of detailed information about borrowings [line items]                    
Subordinated loans                 € 1,250  
Borrowings, interest rate                 4.38%  
4.25% Fixed Rate Subordinated Tier 2 Notes (EUR)                    
Disclosure of detailed information about borrowings [line items]                    
Subordinated loans               € 1,250    
Borrowings, interest rate               4.25%    
7.25% Perpetual Additional Tier 1 Contingent Convertible Capital Securities (USD)                    
Disclosure of detailed information about borrowings [line items]                    
Subordinated loans | $             $ 1,000      
Borrowings, interest rate             7.25%      
8.50% Fixed Rate Subordinated Tier 2 Notes (USD) | ING Turkiye                    
Disclosure of detailed information about borrowings [line items]                    
Subordinated loans | $             $ 150      
Borrowings, interest rate             8.50%      
6.75% Perpetual Additional Tier 1 Contingent Convertible Capital Securities (USD)                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate   6.75%                
Redemption of subordinated loans | $   $ 1,250                
2.50% Fixed Rate Subordinated Tier 2 Notes (USD)                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate                   2.50%
Redemption of subordinated loans     € 750              
1.63% Fixed Rate Subordinated Tier 2 Notes (USD)                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate             1.63%      
Redemption of subordinated loans € 1,000                  
Subordinated Loans | Average                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate       4.59% 4.44%          
[1] Cash flows are reported on a gross basis and include investments and borrowings of short term securities