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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 | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Financial Assets [Line Items] |  |
Opening balance as at 1 January | € 31,625 | € 30,635
Additions | 19,995 | 18,806
Amortisation | 31 | (18)
Transfers and reclassifications | 5 | 10
Changes in unrealised revaluations | 725 | (3,295)
Impairments | (1) |
Reversals of impairments | 6 | 3
Disposals and redemptions | (11,913) | (14,526)
Exchange rate differences | 651 | 10
Changes in the composition of the group and other changes | (6) | 1
Closing balance | 41,116 | 31,625
FVOCI equity securities |  |
Disclosure Of Financial Assets [Line Items] |  |
Opening balance as at 1 January | 1,887 | 2,457
Additions | 28 | 17
Amortisation |  |
Transfers and reclassifications | 5 | 10
Changes in unrealised revaluations | 68 | (65)
Impairments |  |
Reversals of impairments |  |
Disposals and redemptions | (2) | (492)
Exchange rate differences | (100) | (39)
Changes in the composition of the group and other changes |  |
Closing balance | 1,885 | 1,887
FVOCI debt instruments |  |
Disclosure Of Financial Assets [Line Items] |  |
Opening balance as at 1 January | 29,739 | 28,178
Additions | 19,967 | 18,789
Amortisation | 31 | (18)
Transfers and reclassifications |  |
Changes in unrealised revaluations | 657 | (3,230)
Impairments | (1) |
Reversals of impairments | 6 | 3
Disposals and redemptions | (11,912) | (14,034)
Exchange rate differences | 751 | 49
Changes in the composition of the group and other changes | (6) | 1
Closing balance | € 39,231 | € 29,739

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