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Note 7 Collateral pledges received (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Collateral received [Member]      
Collateral pledges received [Line Items]      
Fair value of encumbered collateral received or own debt securities issued € 40,701 € 40,905 € 30,723
Fair value of collateral received or own debt securities issued available for encumbrance 9,415 17,029 8,652
Fair value of collateral received or own debt securities issued nor available for encumbrance 1,279 1,719 1,071
equity instruments [Member]      
Collateral pledges received [Line Items]      
Fair value of encumbered collateral received or own debt securities issued 323 289 239
Fair value of collateral received or own debt securities issued available for encumbrance 759 265 204
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 40,378 40,616 30,484
Fair value of collateral received or own debt securities issued available for encumbrance 8,656 16,764 8,448
Fair value of collateral received or own debt securities issued nor available for encumbrance 1,279 1,719 1,071
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 3
Fair value of collateral received or own debt securities issued available for encumbrance 92 50 94
Fair value of collateral received or own debt securities issued nor available for encumbrance € 0 € 0 € 0