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Note 7 Collateral pledges received (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Collateral received [Member]      
Collateral pledges received [Line Items]      
Fair value of encumbered collateral received or own debt securities issued € 40,905 € 30,723 € 38,496
Fair value of collateral received or own debt securities issued available for encumbrance 17,029 8,652 9,208
Fair value of collateral received or own debt securities issued nor available for encumbrance 1,719 1,071 48
equity instruments [Member]      
Collateral pledges received [Line Items]      
Fair value of encumbered collateral received or own debt securities issued 289 239 65
Fair value of collateral received or own debt securities issued available for encumbrance 265 204 70
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 40,616 30,484 38,431
Fair value of collateral received or own debt securities issued available for encumbrance 16,764 8,448 9,130
Fair value of collateral received or own debt securities issued nor available for encumbrance 1,719 1,071 38
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 8
Fair value of collateral received or own debt securities issued nor available for encumbrance 0 0 10
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 3 0
Fair value of collateral received or own debt securities issued available for encumbrance 50 94 82
Fair value of collateral received or own debt securities issued nor available for encumbrance € 0 € 0 € 0