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Financial assets at fair value through other comprehensive income - Summary of changes in fair value through other comprehensive income financial assets (Details) - Financial assets at FVOCI - EUR (€) € in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Disclosure of financial assets [line items] |  |
Opening balance as at 1 January | € 46,389 | € 41,116
Additions | 11,318 | 21,091
Amortisation | 36 | 77
Transfers and reclassifications | 6 | 1
Changes in unrealised revaluations | 668 | 509
Impairments | (1) | 2
Reversals of impairments | 1 | (7)
Disposals and redemptions | (7,168) | (16,907)
Exchange rate differences | (1,385) | 506
Other changes | (19) |
Closing balance | 49,846 | 46,389
FVOCI equity securities |  |
Disclosure of financial assets [line items] |  |
Opening balance as at 1 January | 2,562 | 1,885
Additions | 158 | 11
Amortisation |  |
Transfers and reclassifications | 8 |
Changes in unrealised revaluations | 275 | 605
Impairments |  |
Reversals of impairments |  |
Disposals and redemptions | (4) | (1)
Exchange rate differences | (226) | 62
Other changes | (19) |
Closing balance | 2,753 | 2,562
FVOCI debt instruments |  |
Disclosure of financial assets [line items] |  |
Opening balance as at 1 January | 43,827 | 39,231
Additions | 11,160 | 21,080
Amortisation | 36 | 77
Transfers and reclassifications | (1) | 1
Changes in unrealised revaluations | 393 | (96)
Impairments | (1) | 2
Reversals of impairments | 1 | (7)
Disposals and redemptions | (7,164) | (16,906)
Exchange rate differences | (1,159) | 443
Other changes |  |
Closing balance | € 47,093 | € 43,827

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Classes of financial instruments [domain]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_25&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35H -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35H&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35M -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35M&doctype=Standard -URIDate 2024-03-27 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35N -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35N&doctype=Standard -URIDate 2024-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35I -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35I&doctype=Standard -URIDate 2024-03-27 + Details
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