v3.26.1
Financial assets - Disclosure of reconciliation of changes in gross carrying amount for financial instruments (Details) - Financial assets at amortised cost - EUR (€)
€ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Write-offs € 6,350 € 6,780
Exchange differences and other 778 (1,774)
Accumulated impairment    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Impairment allowance at beginning of year 21,595 22,326
Impairment allowance at end of year 23,417 21,086
Accumulated impairment | Other assets    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Impairment allowance at end of year 7,974 7,479
Accumulated impairment | Impaired assets    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Impairment allowance at end of year 15,443 13,607
Accumulated impairment | Loans and advances to customers    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Impairment allowance at beginning of year 21,076 21,983
Transfers between stages 4,609 3,752
Net changes of the exposure and modifications in the credit risk 2,748 3,507
Write-offs (6,298) (6,717)
Exchange differences and other 524 (1,836)
Impairment allowance at end of year 22,659 20,689
Accumulated impairment | Loans and advances to customers | Other assets | Next 12 months    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Impairment allowance at beginning of year 2,975 3,281
Transfers between stages (577) (769)
Net changes of the exposure and modifications in the credit risk 850 663
Write-offs 0 0
Exchange differences and other (94) (217)
Impairment allowance at end of year 3,154 2,958
Accumulated impairment | Loans and advances to customers | Other assets | Lifetime expected credit losses    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Impairment allowance at beginning of year 4,623 4,735
Transfers between stages 484 596
Net changes of the exposure and modifications in the credit risk (485) (469)
Write-offs 0 0
Exchange differences and other 75 (411)
Impairment allowance at end of year 4,697 4,451
Accumulated impairment | Loans and advances to customers | Impaired assets | Lifetime expected credit losses    
Disclosure of reconciliation of changes in loss allowance of financial instruments    
Impairment allowance at beginning of year 13,478 13,967
Transfers between stages 4,702 3,925
Net changes of the exposure and modifications in the credit risk 2,383 3,313
Write-offs (6,298) (6,717)
Exchange differences and other 543 (1,208)
Impairment allowance at end of year € 14,808 € 13,280