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Note 44 Administrative expenses (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Other administrative expense [Line Items]      
Technology and systems € 1,176 € 1,088 € 1,060
Communication expense 175 172 181
Advertising expense 207 186 250
Property Fixtures And Materials expense 380 404 477
Taxes Other Than Income Tax 347 344 378
Surveillance and security service expense 179 161 188
Other expenses 786 749 885
Other expense, by function € 3,249 € 3,105 € 3,418