v3.26.1
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, 2026
Dec. 31, 2025
Disclosure of financial assets [line items]    
Opening balance as at 1 January € 56,662 € 46,389
Additions 28,505 43,294
Amortisation 28 75
Transfers and reclassifications  10
Changes in unrealised revaluations (41) 166
Impairments (10) (10)
Reversals of impairments 8 7
Disposals and redemptions (22,454) (33,131)
Exchange rate differences 352 (1,267)
Other changes (7) 1,128
Closing balance 63,043 56,662
FVOCI equity securities    
Disclosure of financial assets [line items]    
Opening balance as at 1 January 2,607 2,562
Additions 1 395
Amortisation
Transfers and reclassifications  10
Changes in unrealised revaluations (60) (156)
Impairments
Reversals of impairments
Disposals and redemptions (1) (7)
Exchange rate differences 107 (178)
Other changes (7) (19)
Closing balance 2,647 2,607
FVOCI debt instruments    
Disclosure of financial assets [line items]    
Opening balance as at 1 January 54,055 43,827
Additions 28,504 42,899
Amortisation 28 75
Transfers and reclassifications 
Changes in unrealised revaluations 19 322
Impairments (10) (10)
Reversals of impairments 8 7
Disposals and redemptions (22,453) (33,124)
Exchange rate differences 245 (1,088)
Other changes 1,148
Closing balance € 60,395 € 54,055