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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 fair value through other comprehensive income - EUR (€)
€ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Disclosure of financial assets [line Items]    
Opening balance as at 1 January € 41,116 € 31,625
Additions 11,040 19,995
Amortisation 31
Transfers and reclassifications  5
Changes in unrealised revaluations (179) 725
Impairments (1)
Reversals of impairments 4 6
Disposals and redemptions (5,915) (11,913)
Exchange rate differences 273 651
Changes in the composition of the group and other changes 5 (6)
Closing balance 46,343 41,116
FVOCI equity securities    
Disclosure of financial assets [line Items]    
Opening balance as at 1 January 1,885 1,887
Additions 3 28
Amortisation
Transfers and reclassifications  5
Changes in unrealised revaluations 462 68
Impairments
Reversals of impairments
Disposals and redemptions (2)
Exchange rate differences 14 (100)
Changes in the composition of the group and other changes
Closing balance 2,364 1,885
FVOCI debt instruments    
Disclosure of financial assets [line Items]    
Opening balance as at 1 January 39,231 29,739
Additions 11,037 19,967
Amortisation 31
Transfers and reclassifications 
Changes in unrealised revaluations (641) 657
Impairments (1)
Reversals of impairments 4 6
Disposals and redemptions (5,915) (11,912)
Exchange rate differences 259 751
Changes in the composition of the group and other changes 5 (6)
Closing balance € 43,979 € 39,231