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Risk management - Schedule of encumbrance of collateral received (Details) - Encumbered assets - Off-balance-sheet assets - Liquidity risk € in Millions | Dec. 31, 2025 EUR (€)
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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

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