v3.25.4
Subordinated loans - Additional information (Details)
€ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2025
EUR (€)
Apr. 30, 2025
USD ($)
Mar. 31, 2025
EUR (€)
Dec. 31, 2025
EUR (€)
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Sep. 30, 2025
USD ($)
Aug. 31, 2025
EUR (€)
May 31, 2025
EUR (€)
Disclosure of detailed information about borrowings [line items]                  
Subordinated loans       € 18,100 € 17,878        
Redemption of subordinated loans [1]       € 135,220 € 113,014 € 90,574      
4.13% Fixed Rate Subordinated Green Tier 2 Notes (EUR)                  
Disclosure of detailed information about borrowings [line items]                  
Subordinated loans                 € 1,250
Borrowings, interest rate                 4.13%
3.88% Fixed Rate Subordinated Tier 2 Notes (EUR)                  
Disclosure of detailed information about borrowings [line items]                  
Subordinated loans               € 1,250  
Borrowings, interest rate               3.88%  
7.00% Perpetual AT1 Contingent Convertible Capital Securities (USD)                  
Disclosure of detailed information about borrowings [line items]                  
Subordinated loans | $             $ 1,500    
Borrowings, interest rate             7.00%    
2.00% Fixed Subordinated Tier 2 Notes (EUR)                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate     2.00%            
Redemption of subordinated loans     € 750            
6.50% Perpetual AT1 Contingent Convertible Capital Securities (USD)                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate   6.50%              
Redemption of subordinated loans | $   $ 1,250              
1.00% Fixed Subordinated Tier 2 Notes (EUR)                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate     1.00%            
Redemption of subordinated loans € 1,000                
[1] Cash flows are reported on a gross basis and include investments and borrowings of short term securities