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Note 35 Fees and commission expense (Details) - EUR (€)
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Fee and commission expense [Line Items]    
Current Accounts Fee € 2,000,000 € 3,000,000
Credit and debit cards expenses 612,000,000 576,000,000
Transfers and other payment orders expenses 56,000,000 46,000,000
Commissions for selling insurance 25,000,000 25,000,000
Custody securities 25,000,000 25,000,000
Other fee and commission expense 275,000,000 254,000,000
Fee and commission expense € 996,000,000 € 929,000,000