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Note 6 - Risk Management - Operations Of Loans Given By The Group With PublicGuarantees (Details)
 6 Months Ended
Jun. 30, 2020
EUR (€)
Group [Member]  
Loans Operations And Amounts Line Items  
Public Guarantees Given By The Group € 13,791,000,000
Private Individuals [Member]  
Loans Operations And Amounts Line Items  
Public Guarantees Given By The Group 863,000,000
Mortages [Member]  
Loans Operations And Amounts Line Items  
Public Guarantees Given By The Group 1,000,000
Small Companies [Member]  
Loans Operations And Amounts Line Items  
Public Guarantees Given By The Group 7,723,000,000
Non Financial Entities [Member]  
Loans Operations And Amounts Line Items  
Public Guarantees Given By The Group 5,126,000,000
Other [Member]  
Loans Operations And Amounts Line Items  
Public Guarantees Given By The Group 79,000,000
Existing Moratoriums [Member] | Group [Member]  
Loans Operations And Amounts Line Items  
Moratoriums Public Guarantees 29,668,000,000
Existing Moratoriums [Member] | Private Individuals [Member]  
Loans Operations And Amounts Line Items  
Moratoriums Public Guarantees 17,975,000,000
Existing Moratoriums [Member] | Mortages [Member]  
Loans Operations And Amounts Line Items  
Moratoriums Public Guarantees 9,318,000,000
Existing Moratoriums [Member] | Small Companies [Member]  
Loans Operations And Amounts Line Items  
Moratoriums Public Guarantees 6,397,000,000
Existing Moratoriums [Member] | Non Financial Entities [Member]  
Loans Operations And Amounts Line Items  
Moratoriums Public Guarantees 5,006,000,000
Existing Moratoriums [Member] | Other [Member]  
Loans Operations And Amounts Line Items  
Moratoriums Public Guarantees 290,000,000
Ended Moratoriums [Member] | Group [Member]  
Loans Operations And Amounts Line Items  
Moratoriums Public Guarantees 6,590,000,000
Ended Moratoriums [Member] | Private Individuals [Member]  
Loans Operations And Amounts Line Items  
Moratoriums Public Guarantees 3,563,000,000
Ended Moratoriums [Member] | Mortages [Member]  
Loans Operations And Amounts Line Items  
Moratoriums Public Guarantees 2,152,000,000
Ended Moratoriums [Member] | Small Companies [Member]  
Loans Operations And Amounts Line Items  
Moratoriums Public Guarantees 792,000,000
Ended Moratoriums [Member] | Non Financial Entities [Member]  
Loans Operations And Amounts Line Items  
Moratoriums Public Guarantees 2,221,000,000
Ended Moratoriums [Member] | Other [Member]  
Loans Operations And Amounts Line Items  
Moratoriums Public Guarantees 14,000,000
Total | Group [Member]  
Loans Operations And Amounts Line Items  
Moratoriums Public Guarantees 36,259,000,000
Total | Private Individuals [Member]  
Loans Operations And Amounts Line Items  
Moratoriums Public Guarantees 21,538,000,000
Total | Mortages [Member]  
Loans Operations And Amounts Line Items  
Moratoriums Public Guarantees 11,470,000,000
Total | Small Companies [Member]  
Loans Operations And Amounts Line Items  
Moratoriums Public Guarantees 7,189,000,000
Total | Non Financial Entities [Member]  
Loans Operations And Amounts Line Items  
Moratoriums Public Guarantees 7,227,000,000
Total | Other [Member]  
Loans Operations And Amounts Line Items  
Moratoriums Public Guarantees € 304,000,000