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Note 6 - Risk Management - Breakdown of Loans and Advances , impaired and accumulated impairment by sectors (Details) - EUR (€)
€ in Millions
Jun. 30, 2018
Dec. 31, 2017
General Governement [Member] | Gross Value Financial Assets Impaired [Member]    
Risk Management Loans And Advances Sectors [Line Items]    
Loans and Advances Impared and Accumulated impairment by sectors € 160 € 171
General Governement [Member] | Percentage Non Performing Loans And Advances [Member]    
Risk Management Loans And Advances Sectors [Line Items]    
Percentage of Loans and Advances Impared and Accumulated impairment by sectors 0.60% 0.50%
General Governement [Member] | impairment Of Accumulated Value [Member]    
Risk Management Loans And Advances Sectors [Line Items]    
Loans and Advances Impared and Accumulated impairment by sectors € (92) € (111)
Credit Institutions [Member] | Gross Value Financial Assets Impaired [Member]    
Risk Management Loans And Advances Sectors [Line Items]    
Loans and Advances Impared and Accumulated impairment by sectors € 10 € 11
Credit Institutions [Member] | Percentage Non Performing Loans And Advances [Member]    
Risk Management Loans And Advances Sectors [Line Items]    
Percentage of Loans and Advances Impared and Accumulated impairment by sectors 0.10% 0.30%
Credit Institutions [Member] | impairment Of Accumulated Value [Member]    
Risk Management Loans And Advances Sectors [Line Items]    
Loans and Advances Impared and Accumulated impairment by sectors € (13) € (36)
Other Financial Institutions [Member] | Gross Value Financial Assets Impaired [Member]    
Risk Management Loans And Advances Sectors [Line Items]    
Loans and Advances Impared and Accumulated impairment by sectors € 12 € 12
Other Financial Institutions [Member] | Percentage Non Performing Loans And Advances [Member]    
Risk Management Loans And Advances Sectors [Line Items]    
Percentage of Loans and Advances Impared and Accumulated impairment by sectors 0.10% 0.10%
Other Financial Institutions [Member] | impairment Of Accumulated Value [Member]    
Risk Management Loans And Advances Sectors [Line Items]    
Loans and Advances Impared and Accumulated impairment by sectors € (18) € (26)
Non-financial corporations | Gross Value Financial Assets Impaired [Member]    
Risk Management Loans And Advances Sectors [Line Items]    
Loans and Advances Impared and Accumulated impairment by sectors € 10,081 € 10,791
Non-financial corporations | Percentage Non Performing Loans And Advances [Member]    
Risk Management Loans And Advances Sectors [Line Items]    
Percentage of Loans and Advances Impared and Accumulated impairment by sectors 5.80% 6.30%
Non-financial corporations | impairment Of Accumulated Value [Member]    
Risk Management Loans And Advances Sectors [Line Items]    
Loans and Advances Impared and Accumulated impairment by sectors € (7,457) € (7,538)
Households [Member] | Gross Value Financial Assets Impaired [Member]    
Risk Management Loans And Advances Sectors [Line Items]    
Loans and Advances Impared and Accumulated impairment by sectors € 8,374 € 8,417
Households [Member] | Percentage Non Performing Loans And Advances [Member]    
Risk Management Loans And Advances Sectors [Line Items]    
Percentage of Loans and Advances Impared and Accumulated impairment by sectors 4.70% 4.70%
Households [Member] | impairment Of Accumulated Value [Member]    
Risk Management Loans And Advances Sectors [Line Items]    
Loans and Advances Impared and Accumulated impairment by sectors € (5,920) € (5,073)
Total [Member] | Gross Value Financial Assets Impaired [Member]    
Risk Management Loans And Advances Sectors [Line Items]    
Loans and Advances Impared and Accumulated impairment by sectors € 18,637 € 19,401
Total [Member] | Percentage Non Performing Loans And Advances [Member]    
Risk Management Loans And Advances Sectors [Line Items]    
Percentage of Loans and Advances Impared and Accumulated impairment by sectors 4.60% 4.50%
Total [Member] | impairment Of Accumulated Value [Member]    
Risk Management Loans And Advances Sectors [Line Items]    
Loans and Advances Impared and Accumulated impairment by sectors € (13,498) € (12,784)