v3.25.4
Regulatory Capital Information (Detail: Text Values) - EUR (€)
€ in Millions, shares in Millions
 1 Months Ended 7 Months Ended 12 Months Ended 36 Months Ended
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
May 21, 2025
May 21, 2025
May 22, 2025
Dec. 31, 2024
May 16, 2024
Share Repurchase Program [Line Items]                  
Approval for share buy back as a percentage of total share capital             10.00%   10.00%
Thereof using derivatives             5.00%   5.00%
Thereof using derivatives with maturities exceeding 18 months             2.00%   2.00%
Shares authorized for buyback (in shares)             194.8   199.5
Thereof using derivatives (in shares)             97.4   99.7
Shares purchased for equity compensation purposes (in shares)     4.6   34.6        
Thereof by exercising call options (in shares)         21.3        
New call options purchased for equity compensation purposes (in shares)         22.7        
Shares purchased for cancellation with the purpose of distributing capital to shareholders (in shares)     30.6   27.9        
Shares held in treasury (in shares) 7.7   7.7 7.7     12.9    
Thereof to be used for equity compensation (in shares)             5.9    
Common shares cancelled (in shares) 37.7                
Authorized capital available to the Management Board € 2,493   € 2,493 € 2,493 € 2,560 € 2,560 € 2,493    
Authorized capital available to the Management Board (in shares)         1,000.0 1,000.0 973.8    
Additional Tier 1 capital authorized amount         € 9,000 € 9,000 € 12,000    
Additional Tier 1 capital Issued   € 1,500 1,000     € 5,750      
Amount recognized as regulatory AT1 capital based on the current CRR outstanding 11,500   11,500 11,500          
Nominal amount of outstanding AT1 instruments 11,700   11,700 11,700          
Nominal amount of AT1 instruments called       2,400          
Nominal amount of AT1 instruments issued       2,500          
Amount recognized as regulatory Tier 2 capital instruments 7,100   7,100 7,100          
Nominal amount of regulatory Tier 2 capital instruments 8,300   € 8,300 8,300          
Nominal amount of Tier 2 capital instruments matured       2,800          
Nominal amount of Tier 2 capital instruments became ineligible       100          
Share Buyback Program 2024-1                  
Share Repurchase Program [Line Items]                  
Shares purchased for cancellation with the purpose of distributing capital to shareholders (in shares)         20.9        
Amount authorized for share buybacks               € 675  
Share Buyback Program 2025-1                  
Share Repurchase Program [Line Items]                  
Shares purchased for cancellation with the purpose of distributing capital to shareholders (in shares)     22.3   7.0        
Amount authorized for share buybacks 750   € 750 750          
Shares held in treasury (in shares)             7.0    
Share Buyback Program 2025-2                  
Share Repurchase Program [Line Items]                  
Shares purchased for cancellation with the purpose of distributing capital to shareholders (in shares)     8.4            
Amount authorized for share buybacks € 250   € 250 € 250