v3.25.2
Financial liabilities - Disclosure of composition of debt instruments excluding promissory notes (Details) - EUR (€)
€ in Millions
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Bonds and debentures outstanding        
Disclosure of financial liabilities [line items]        
Financial liabilities € 244,891 € 252,765 € 239,696 € 231,880
Subordinated        
Disclosure of financial liabilities [line items]        
Financial liabilities 30,951 35,461 € 32,111 € 30,529
Debt instruments        
Disclosure of financial liabilities [line items]        
Financial liabilities 311,963 325,521    
Debt instruments | Bonds and debentures outstanding        
Disclosure of financial liabilities [line items]        
Financial liabilities 244,891 252,765    
Debt instruments | Subordinated        
Disclosure of financial liabilities [line items]        
Financial liabilities 30,951 35,461    
Debt instruments | Promissory notes and other securities        
Disclosure of financial liabilities [line items]        
Financial liabilities € 36,121 € 37,295