v3.26.1
Loans and advances to customers - Schedule of changes in the impairment losses for loans and advances to customers (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period € 283,497 € 243,203  
Financial assets at end of period 300,026 283,497 € 243,203
Customers      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 1,054,069 1,036,349  
Financial assets at end of period 1,037,288 1,054,069 1,036,349
Customers | Gross carrying amount      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 1,076,194 1,059,137  
Financial assets at end of period 1,058,446 1,076,194 1,059,137
Customers | Financial instruments credit-impaired      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Net additions 13,648 13,779 14,944
Written-off assets (13,266) (13,212) (13,847)
Changes in the scope of consolidation 0 17 (59)
Exchange differences and other (2,536) (947) 168
Customers | Financial instruments credit-impaired | Gross carrying amount      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 33,731 34,094 32,888
Financial assets at end of period € 31,577 € 33,731 € 34,094