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Note 7 Collateral pledges received (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Collateral received [Member]      
Collateral pledges received [Line Items]      
Fair value of encumbered collateral received or own debt securities issued € 40,877 € 73,836 € 40,701
Fair value of collateral received or own debt securities issued available for encumbrance 14,917 14,825 9,415
Fair value of collateral received or own debt securities issued nor available for encumbrance 1,151 996 1,279
equity instruments [Member]      
Collateral pledges received [Line Items]      
Fair value of encumbered collateral received or own debt securities issued 215 1,019 323
Fair value of collateral received or own debt securities issued available for encumbrance 162 51 759
Fair value of collateral received or own debt securities issued nor available for encumbrance 0 0 0
Debt securities [Member]      
Collateral pledges received [Line Items]      
Fair value of encumbered collateral received or own debt securities issued 40,663 72,817 40,378
Fair value of collateral received or own debt securities issued available for encumbrance 14,754 14,774 8,656
Fair value of collateral received or own debt securities issued nor available for encumbrance 1,151 996 1,279
Loans and advances and other assets [Member]      
Collateral pledges received [Line Items]      
Fair value of encumbered collateral received or own debt securities issued 0 0 0
Fair value of collateral received or own debt securities issued available for encumbrance 0 0 0
Fair value of collateral received or own debt securities issued nor available for encumbrance 0 0 0
Own debt securities issued other than own covered bonds [Member]      
Collateral pledges received [Line Items]      
Fair value of encumbered collateral received or own debt securities issued 0 0 0
Fair value of collateral received or own debt securities issued available for encumbrance 66 74 92
Fair value of collateral received or own debt securities issued nor available for encumbrance € 0 € 0 € 0