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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
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of financial assets [line items] |  |
Opening balance as at 1 January | € 41,116 | € 31,625
Additions | 21,091 | 19,995
Amortisation | 77 | 31
Transfers and reclassifications | 1 | 5
Changes in unrealised revaluations | 509 | 725
Impairments | 2 | (1)
Reversals of impairments | (7) | 6
Disposals and redemptions | (16,907) | (11,913)
Exchange rate differences | 506 | 651
Other changes |  | (6)
Closing balance | 46,389 | 41,116
FVOCI equity securities |  |
Disclosure of financial assets [line items] |  |
Opening balance as at 1 January | 1,885 | 1,887
Additions | 11 | 28
Amortisation |  |
Transfers and reclassifications |  | 5
Changes in unrealised revaluations | 605 | 68
Impairments |  |
Reversals of impairments |  |
Disposals and redemptions | (1) | (2)
Exchange rate differences | 62 | (100)
Other changes |  |
Closing balance | 2,562 | 1,885
FVOCI debt instruments |  |
Disclosure of financial assets [line items] |  |
Opening balance as at 1 January | 39,231 | 29,739
Additions | 21,080 | 19,967
Amortisation | 77 | 31
Transfers and reclassifications | 1 |
Changes in unrealised revaluations | (96) | 657
Impairments | 2 | (1)
Reversals of impairments | (7) | 6
Disposals and redemptions | (16,906) | (11,912)
Exchange rate differences | 443 | 751
Other changes |  | (6)
Closing balance | € 43,827 | € 39,231

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