v3.25.4
Debt securities in issue - Summary of maturities of debt securities in issue (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of financial liabilities [line items]    
Debt securities in issue € 151,231 € 142,367
More than 5 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue 34,522 34,857
Fixed rate debt securities    
Disclosure of financial liabilities [line items]    
Debt securities in issue 112,760 107,416
Fixed rate debt securities | Within 1 year    
Disclosure of financial liabilities [line items]    
Debt securities in issue 34,021 27,333
Fixed rate debt securities | More than 1 year but less than 2 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue 10,392 13,085
Fixed rate debt securities | More than 2 years but less than 3 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue 13,898 10,857
Fixed rate debt securities | More than 3 years but less than 4 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue 12,624 13,300
Fixed rate debt securities | More than 4 years but less than 5 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue 13,093 12,201
Fixed rate debt securities | More than 5 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue 28,731 30,640
Floating rate debt securities    
Disclosure of financial liabilities [line items]    
Debt securities in issue 38,472 34,951
Floating rate debt securities | Within 1 year    
Disclosure of financial liabilities [line items]    
Debt securities in issue 28,774 26,262
Floating rate debt securities | More than 1 year but less than 2 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue 1,761 2,821
Floating rate debt securities | More than 2 years but less than 3 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue 830 1,939
Floating rate debt securities | More than 3 years but less than 4 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue 1,688 117
Floating rate debt securities | More than 4 years but less than 5 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue 913 902
Floating rate debt securities | More than 5 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue € 4,506 € 2,910