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Provisions - Additional information (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of Provisions [Line Items]        
Other provisions, amount expected to be settled within twelve months € 574 € 720    
Additions 288 325    
Miscellaneous other liabilities 12,369 13,667    
Total equity 53,698 55,628 € 57,004 € 52,802
Accumulated impairments        
Disclosure of Provisions [Line Items]        
Expected credit losses 6,049 5,839    
Accumulated impairments | Non-financial guarantees        
Disclosure of Provisions [Line Items]        
Expected credit losses     151  
IAS 37 & IFRS 9 Off-Balance Provisions        
Disclosure of Provisions [Line Items]        
Miscellaneous other liabilities     109  
Adjustment        
Disclosure of Provisions [Line Items]        
Total equity [1]     (46) € 64
Compensation of Dutch retail customers        
Disclosure of Provisions [Line Items]        
Additions 180 75    
Other provisions        
Disclosure of Provisions [Line Items]        
Additions € 26 € 39    
Other provisions | Adjustment | Increase (decrease) due to changes in accounting policy        
Disclosure of Provisions [Line Items]        
Total equity     € 42  
[1] Changes in policy following the adoption of IFRS 17 and change in policy for non-financial guarantees.