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Note 39 Administrative expenses (Details) - EUR (€)
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Disclosure of Other administrative expense [Line Items]    
Technology and systems € 565,000,000 € 558,000,000
Communication expense 87,000,000 88,000,000
Advertising expense 101,000,000 99,000,000
Property Fixtures And Materials expense 190,000,000 211,000,000
Taxes Other Than Income Tax 201,000,000 188,000,000
Surveillance and security service expense 85,000,000 80,000,000
Other expenses 383,000,000 392,000,000
Administrative expenses € 1,612,000,000 € 1,614,000,000