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Note 7 - Risk Management - Simulated Scenarios (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Breakdown levels of VaR Line Items    
Percentage of risk linked to interest rates at the year end closign 55% 48%
Percentage of exchange rate risk at the year end closing The relative weight has increased compared with the close of 2017 (48%). Exchange-rate risk maintains its proportion with respect to 2017 (14%) 14%
Percentage of equity volatility and correlation risk at the year end closing 31% 38%
Level of confidence when estimate the maximun daily loss of a portfolio 99%  
Time horizon when estimate the maximun daily loss of a portfolio 1-day horizon  
Number of exceptions in the internal VaR calculation model 0-4 exceptions  
Europe [Member]    
Breakdown levels of VaR Line Items    
Value At Risk € (99)  
Mexico [Member]    
Breakdown levels of VaR Line Items    
Value At Risk (33)  
Peru [Member]    
Breakdown levels of VaR Line Items    
Value At Risk (11)  
Venezuela [Member]    
Breakdown levels of VaR Line Items    
Value At Risk 0  
Argetina [Member]    
Breakdown levels of VaR Line Items    
Value At Risk (5)  
Colombia [Member]    
Breakdown levels of VaR Line Items    
Value At Risk (6)  
Turkey [Member]    
Breakdown levels of VaR Line Items    
Value At Risk (6)  
Compass [Member]    
Breakdown levels of VaR Line Items    
Value At Risk € (1)