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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, 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