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Note 10 - Financial assets and liabilities held for trading. Financial assets held for trading equity instruments by issuer (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial Assets and liabilities held for trading Equity Instruments Line Items      
Equity Instruments Held For Trading € 5,254 € 6,801 € 4,675
Total domestic [Member] | Credit Institutions [Member]      
Financial Assets and liabilities held for trading Equity Instruments Line Items      
Equity Instruments Held For Trading 576 617 781
Total domestic [Member] | Other [Member]      
Financial Assets and liabilities held for trading Equity Instruments Line Items      
Equity Instruments Held For Trading 536 603 956
Total domestic [Member] | Total [Member]      
Financial Assets and liabilities held for trading Equity Instruments Line Items      
Equity Instruments Held For Trading 1,112 1,220 1,737
Total foreign [Member] | Credit Institutions [Member]      
Financial Assets and liabilities held for trading Equity Instruments Line Items      
Equity Instruments Held For Trading 304 345 220
Total foreign [Member] | Other [Member]      
Financial Assets and liabilities held for trading Equity Instruments Line Items      
Equity Instruments Held For Trading 3,838 5,236 2,718
Total foreign [Member] | Total [Member]      
Financial Assets and liabilities held for trading Equity Instruments Line Items      
Equity Instruments Held For Trading 4,142 5,581 2,939
Total [Member] | Total [Member]      
Financial Assets and liabilities held for trading Equity Instruments Line Items      
Equity Instruments Held For Trading € 5,254 € 6,801 € 4,675