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Debt securities in issue - Summary of maturities of debt securities in issue (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial liabilities [line items]    
Debt securities in issue € 124,670 € 95,918
More than 5 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue 31,196 34,335
Fixed rate debt securities    
Disclosure of financial liabilities [line items]    
Debt securities in issue 101,645 78,539
Fixed rate debt securities | Within 1 year    
Disclosure of financial liabilities [line items]    
Debt securities in issue 31,255 21,176
Fixed rate debt securities | More than 1 year but less than 2 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue 7,855 2,777
Fixed rate debt securities | More than 2 years but less than 3 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue 13,361 7,897
Fixed rate debt securities | More than 3 years but less than 4 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue 10,265 10,067
Fixed rate debt securities | More than 4 years but less than 5 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue 11,924 8,039
Fixed rate debt securities | More than 5 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue 26,987 28,582
Floating rate debt securities    
Disclosure of financial liabilities [line items]    
Debt securities in issue 23,025 17,379
Floating rate debt securities | Within 1 year    
Disclosure of financial liabilities [line items]    
Debt securities in issue 17,871 15,286
Floating rate debt securities | More than 1 year but less than 2 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue 226 307
Floating rate debt securities | More than 2 years but less than 3 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue 2,624 256
Floating rate debt securities | More than 3 years but less than 4 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue 880 958
Floating rate debt securities | More than 4 years but less than 5 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue 0 467
Floating rate debt securities | More than 5 years    
Disclosure of financial liabilities [line items]    
Debt securities in issue € 1,423 € 105