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Condensed financial information of the parent company - Five-year schedule of maturities of debt (Details) - Parent company - EUR (€) € in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Subordinated Loans |  |
Condensed Financial Statements, Captions [Line Items] |  |
Borrowings | € 16,330 | € 16,441
Subordinated Loans | Within 1 year |  |
Condensed Financial Statements, Captions [Line Items] |  |
Borrowings |  |
Subordinated Loans | More than 1 year but less than 2 years |  |
Condensed Financial Statements, Captions [Line Items] |  |
Borrowings |  |
Subordinated Loans | More than 2 years but less than 3 years |  |
Condensed Financial Statements, Captions [Line Items] |  |
Borrowings |  |
Subordinated Loans | More than 3 years but less than 4 years |  |
Condensed Financial Statements, Captions [Line Items] |  |
Borrowings |  |
Subordinated Loans | More than 4 years but less than 5 years |  |
Condensed Financial Statements, Captions [Line Items] |  |
Borrowings |  |
Subordinated Loans | More than 5 years |  |
Condensed Financial Statements, Captions [Line Items] |  |
Borrowings | 9,317 | 10,113
Subordinated Loans | Maturity not applicable |  |
Condensed Financial Statements, Captions [Line Items] |  |
Borrowings | 7,014 | 6,329
Debenture loans |  |
Condensed Financial Statements, Captions [Line Items] |  |
Borrowings | 42,569 | 41,609
Debenture loans | Within 1 year |  |
Condensed Financial Statements, Captions [Line Items] |  |
Borrowings | 1,474 | 4,639
Debenture loans | More than 1 year but less than 2 years |  |
Condensed Financial Statements, Captions [Line Items] |  |
Borrowings | 3,250 | 1,570
Debenture loans | More than 2 years but less than 3 years |  |
Condensed Financial Statements, Captions [Line Items] |  |
Borrowings | 7,616 | 3,250
Debenture loans | More than 3 years but less than 4 years |  |
Condensed Financial Statements, Captions [Line Items] |  |
Borrowings | 7,049 | 7,716
Debenture loans | More than 4 years but less than 5 years |  |
Condensed Financial Statements, Captions [Line Items] |  |
Borrowings | 7,306 | 5,563
Debenture loans | More than 5 years |  |
Condensed Financial Statements, Captions [Line Items] |  |
Borrowings | 15,875 | 18,872
Debenture loans | Maturity not applicable |  |
Condensed Financial Statements, Captions [Line Items] |  |
Borrowings |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 04 -Paragraph a -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 5 -Subsection 04 -Paragraph c -Subparagraph Schedule I -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 7 -Subsection 05 -Paragraph c -Subparagraph Schedule II -Publisher SEC Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 9 -Subsection 06 -Publisher SEC + Details
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