v3.26.1
Marketable debt securities - Disclosure of maturity analysis of debt instruments, notional amounts (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Marketable debt securities      
Notional amount € 505,992 € 511,727 € 418,294
3 to 12 months      
Marketable debt securities      
Notional amount 120,662 145,627 112,546
More than 5 years      
Marketable debt securities      
Notional amount 48,445 € 43,894 € 28,309
Marketable debt securities | Debt securities issued      
Marketable debt securities      
Notional amount 319,932    
Marketable debt securities | Debt securities issued | Within 3 months      
Marketable debt securities      
Notional amount 38,803    
Marketable debt securities | Debt securities issued | 3 to 12 months      
Marketable debt securities      
Notional amount 48,596    
Marketable debt securities | Debt securities issued | 1 to 3 years      
Marketable debt securities      
Notional amount 95,699    
Marketable debt securities | Debt securities issued | 3 to 5 years      
Marketable debt securities      
Notional amount 64,614    
Marketable debt securities | Debt securities issued | More than 5 years      
Marketable debt securities      
Notional amount 72,220    
Marketable debt securities | Subordinated debt      
Marketable debt securities      
Notional amount 27,715    
Marketable debt securities | Subordinated debt | Within 3 months      
Marketable debt securities      
Notional amount 0    
Marketable debt securities | Subordinated debt | 3 to 12 months      
Marketable debt securities      
Notional amount 790    
Marketable debt securities | Subordinated debt | 1 to 3 years      
Marketable debt securities      
Notional amount 1,744    
Marketable debt securities | Subordinated debt | 3 to 5 years      
Marketable debt securities      
Notional amount 2,255    
Marketable debt securities | Subordinated debt | More than 5 years      
Marketable debt securities      
Notional amount 22,926    
Marketable debt securities | Senior unsecured debt      
Marketable debt securities      
Notional amount 143,457    
Marketable debt securities | Senior unsecured debt | Within 3 months      
Marketable debt securities      
Notional amount 10,056    
Marketable debt securities | Senior unsecured debt | 3 to 12 months      
Marketable debt securities      
Notional amount 12,654    
Marketable debt securities | Senior unsecured debt | 1 to 3 years      
Marketable debt securities      
Notional amount 50,189    
Marketable debt securities | Senior unsecured debt | 3 to 5 years      
Marketable debt securities      
Notional amount 34,089    
Marketable debt securities | Senior unsecured debt | More than 5 years      
Marketable debt securities      
Notional amount 36,469    
Marketable debt securities | Senior secured debt      
Marketable debt securities      
Notional amount 107,244    
Marketable debt securities | Senior secured debt | Within 3 months      
Marketable debt securities      
Notional amount 11,038    
Marketable debt securities | Senior secured debt | 3 to 12 months      
Marketable debt securities      
Notional amount 12,110    
Marketable debt securities | Senior secured debt | 1 to 3 years      
Marketable debt securities      
Notional amount 43,467    
Marketable debt securities | Senior secured debt | 3 to 5 years      
Marketable debt securities      
Notional amount 28,116    
Marketable debt securities | Senior secured debt | More than 5 years      
Marketable debt securities      
Notional amount 12,513    
Marketable debt securities | Promissory notes and other securities      
Marketable debt securities      
Notional amount 41,516    
Marketable debt securities | Promissory notes and other securities | Within 3 months      
Marketable debt securities      
Notional amount 17,709    
Marketable debt securities | Promissory notes and other securities | 3 to 12 months      
Marketable debt securities      
Notional amount 23,042    
Marketable debt securities | Promissory notes and other securities | 1 to 3 years      
Marketable debt securities      
Notional amount 299    
Marketable debt securities | Promissory notes and other securities | 3 to 5 years      
Marketable debt securities      
Notional amount 154    
Marketable debt securities | Promissory notes and other securities | More than 5 years      
Marketable debt securities      
Notional amount € 312