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Equity - Schedule of changes in revaluation, cash flow, and property reserve (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of equity [Line Items] |  |  |
Opening balance | € (2,192) | € (540) |
Closing balance | (2,767) | (2,192) | € (540)
Reserve of gain loss FVOCI | Equity securities |  |  |
Disclosure of equity [Line Items] |  |  |
Opening balance | 1,187 | 1,282 | 1,181
Unrealised revaluations | (35) | (118) | 94
Realised revaluations transferred to retained earnings | 1 | 23 | 6
Closing balance | 1,152 | 1,187 | 1,282
Reserve of gain loss FVOCI | Debt securities |  |  |
Disclosure of equity [Line Items] |  |  |
Opening balance | (341) | 96 | 309
Unrealised revaluations | 53 | (412) | (173)
Realised gains/losses transferred to the statement of profit or loss | 9 | (25) | (40)
Closing balance | (280) | (341) | 96
Cash flow hedge |  |  |
Disclosure of equity [Line Items] |  |  |
Opening balance | (3,055) | (153) | 1,450
Unrealised revaluations | 997 | (2,901) | (1,603)
Closing balance | (2,058) | (3,055) | (153)
Credit liability |  |  |
Disclosure of equity [Line Items] |  |  |
Opening balance | 70 | (80) | (117)
Realised revaluations transferred to retained earnings |  | (15) |
Changes in credit liability reserve | (39) | 165 | 37
Closing balance | 31 | 70 | (80)
Property in own use |  |  |
Disclosure of equity [Line Items] |  |  |
Opening balance | 176 | 208 | 221
Unrealised revaluations | 10 | 15 | (2)
Realised revaluations transferred to retained earnings | (8) | (26) | (11)
Closing balance | € 178 | 176 | 208
Property in own use | Impact IAS 29 on opening balance |  |  |
Disclosure of equity [Line Items] |  |  |
Opening balance |  | € (20) |
Closing balance |  |  | € (20)

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- Definition The increase (decrease) in equity resulting from transfers between a revaluation surplus and retained earnings. [Refer: Retained earnings; Revaluation surplus] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 106 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_106_d&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition A component of equity representing reserves within equity, not including retained earnings. [Refer: Retained earnings] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 78 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_78_e&doctype=Standard -URIDate 2023-03-23 + Details
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