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Note 7 - Risk Management - Amounts of moratoriums and financing with public guarantee (Details)
Dec. 31, 2020
EUR (€)
Moratorium [Member] | Moratorium In Force [Member]  
Group Moratorium Line Item  
Financing Public Guarantee Amounts Moratoriums € 6,803,218,723.33925
Moratorium [Member] | Moratorium Completed [Member]  
Group Moratorium Line Item  
Financing Public Guarantee Amounts Moratoriums 27,024,511,762.325
Moratorium [Member] | Moratorium Total [Member]  
Group Moratorium Line Item  
Financing Public Guarantee Amounts Moratoriums 33,827,730,485.6642
Moratorium [Member] | Moratorium Number Customers [Member]  
Group Moratorium Line Item  
Financing Public Guarantee Amounts Moratoriums 2,843,977,000,000
Total Financing With Public Guarantee [Member] | Moratorium Total [Member]  
Group Moratorium Line Item  
Financing Public Guarantee Amounts Moratoriums 18,618,684,066.9345
Total Financing With Public Guarantee [Member] | Moratorium Number Customers [Member]  
Group Moratorium Line Item  
Financing Public Guarantee Amounts Moratoriums 271,870,000,000
Financing Public Guarantee Amounts Moratoriums € 52,446,414,552.5987
Percentage of loans and advances Domain [Member]  
Group Moratorium Line Item  
Financing public guarantee amounts moratoriums percentage credit investment 0.131