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Equity - Schedule of changes in revaluation, cash flow, and property reserve (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of equity [Line Items] |  |  |
Opening balance | € (2,767) | € (2,192) |
Closing balance | (687) | (2,767) | € (2,192)
Reserve of gain loss FVOCI | Equity securities |  |  |
Disclosure of equity [Line Items] |  |  |
Opening balance | 1,152 | 1,187 | 1,282
Unrealised revaluations | 664 | (35) | (118)
Realised revaluations transferred to retained earnings | 0 | 1 | 23
Closing balance | 1,816 | 1,152 | 1,187
Reserve of gain loss FVOCI | - Debt securities |  |  |
Disclosure of equity [Line Items] |  |  |
Opening balance | (280) | (341) | 96
Unrealised revaluations | (261) | 53 | (412)
Realised gains/losses transferred to the statement of profit or loss | 62 | 9 | (25)
Closing balance | (479) | (280) | (341)
Cash flow hedge |  |  |
Disclosure of equity [Line Items] |  |  |
Opening balance | (2,058) | (3,055) | (153)
Unrealised revaluations | 365 | 997 | (2,901)
Closing balance | (1,693) | (2,058) | (3,055)
Credit liability |  |  |
Disclosure of equity [Line Items] |  |  |
Opening balance | 31 | 70 | (80)
Realised revaluations transferred to retained earnings |  |  | (15)
Changes in credit liability reserve | (46) | (39) | 165
Closing balance | (15) | 31 | 70
Reserve of property in own use |  |  |
Disclosure of equity [Line Items] |  |  |
Opening balance | 178 | 176 | 208
Unrealised revaluations | 3 | 10 | 15
Realised revaluations transferred to retained earnings | (20) | (8) | (26)
Closing balance | € 161 | € 178 | 176
Reserve of property in own use | Impact IAS 29 on opening balance |  |  |
Disclosure of equity [Line Items] |  |  |
Opening 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 2024-01-01 -Paragraph 106 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_106_d&doctype=Standard -URIDate 2024-03-27 + 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 2024-01-01 -Paragraph 78 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78_e&doctype=Standard -URIDate 2024-03-27 + Details
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