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Note 14 - Financial assets at amortised cost- Debt Securities (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Loans And Receivables Debt Securities Line Items      
Impairment loss € 208 € 158 € 136
General Government [Member]      
Disclosure Of Loans And Receivables Debt Securities Line Items      
Total Gross Debt Securities 25,014 17,030 20,736
Credit Institutions [Member]      
Disclosure Of Loans And Receivables Debt Securities Line Items      
Total Gross Debt Securities 644 1,152 1,688
Other Issuers [Member]      
Disclosure Of Loans And Receivables Debt Securities Line Items      
Total Gross Debt Securities 6,872 5,911 6,481
Total [Member]      
Disclosure Of Loans And Receivables Debt Securities Line Items      
Total Gross Debt Securities 32,530 24,093 28,905
Impairment loss € (51) € (15) € (17)