v3.26.1
Risk management - Schedule of encumbrance of collateral received (Details) - Encumbered assets - Off-balance-sheet assets - Liquidity risk
€ in Millions
Dec. 31, 2025
EUR (€)
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Fair value of encumbered collateral received or own debt securities issued € 185,200.0
Fair value of collateral received or own debt securities issued available for encumbrance 70,300.0
Loans and advances  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Fair value of encumbered collateral received or own debt securities issued 500.0
Fair value of collateral received or own debt securities issued available for encumbrance 0.0
Equity instruments  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Fair value of encumbered collateral received or own debt securities issued 12,200.0
Fair value of collateral received or own debt securities issued available for encumbrance 7,100.0
Debt securities  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Fair value of encumbered collateral received or own debt securities issued 172,500.0
Fair value of collateral received or own debt securities issued available for encumbrance 63,100.0
Other collateral received  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Fair value of encumbered collateral received or own debt securities issued 0.0
Fair value of collateral received or own debt securities issued available for encumbrance 100.0
Own debt securities issued other than own covered bonds or ABSs  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Fair value of encumbered collateral received or own debt securities issued 1,400.0
Fair value of collateral received or own debt securities issued available for encumbrance € 1,100.0