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Note 19 - Tax assets and liabilities- Changes in tax rate - Deferred tax assets by country (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Secured Tax Assets by country Line Items      
Deferred tax assets unsecured in percentage On the other hand, the Group has not recognized certain deductible temporary differences, negative tax bases and deductions for which, in general, there is no legal period for offsetting, amounting to approximately € 2,236 million, which are mainly originated by Catalunya Banc.    
Spain | Credit for tax loss [Member]      
Secured Tax Assets by country Line Items      
Defrered tax assets unsecured € 1,462,000    
Spain | Temporary differences [Member]      
Secured Tax Assets by country Line Items      
Defrered tax assets unsecured 1,191,000    
Spain | Total Net Deferred Tax Assets [Member]      
Secured Tax Assets by country Line Items      
Defrered tax assets unsecured € 2,653,000 € 2,052,000 € 2,007,000
Mexico [Member] | Credit for tax loss [Member]      
Secured Tax Assets by country Line Items      
Deferred tax assets unsecured in percentage The remainders are tax credits carry forwards    
Mexico [Member] | Temporary differences [Member]      
Secured Tax Assets by country Line Items      
Deferred tax assets unsecured in percentage 99.97% of deferred tax assets as of December 31, 2018 relate to temporary differences    
Mexico [Member] | Total Net Deferred Tax Assets [Member]      
Secured Tax Assets by country Line Items      
Defrered tax assets unsecured € 826,000 615,000 698,000
South America [Member] | Credit for tax loss [Member]      
Secured Tax Assets by country Line Items      
Deferred tax assets unsecured in percentage only 1.03% are related to tax credits    
South America [Member] | Temporary differences [Member]      
Secured Tax Assets by country Line Items      
Deferred tax assets unsecured in percentage Practically all the deferred tax assets are related to temporary differences    
South America [Member] | Total Net Deferred Tax Assets [Member]      
Secured Tax Assets by country Line Items      
Defrered tax assets unsecured € 383 26,000 362,000
United States [Member] | Temporary differences [Member]      
Secured Tax Assets by country Line Items      
Deferred tax assets unsecured in percentage All the deferred tax assets relate to temporary differences    
United States [Member] | Total Net Deferred Tax Assets [Member]      
Secured Tax Assets by country Line Items      
Defrered tax assets unsecured € 164,000 180,000 345,000
Turkey [Member] | Credit for tax loss [Member]      
Secured Tax Assets by country Line Items      
Deferred tax assets unsecured in percentage all the deferred tax assets correspond to €15 million of tax credits related to tax losses carry forwards and deductions    
Turkey [Member] | Temporary differences [Member]      
Secured Tax Assets by country Line Items      
Deferred tax assets unsecured in percentage and €235 million relate to temporary differences    
Turkey [Member] | Total Net Deferred Tax Assets [Member]      
Secured Tax Assets by country Line Items      
Defrered tax assets unsecured € 250,000 € 224,000 € 135,000