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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
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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

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