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Note 41 - Gains (losses) on financial assets and liabilities (net) and Exchange Differences - Breakdown by nature of the financial instrument (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Securities [Member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems      
Equity Instruments, gains (losses) on financial instruments € 354 € 545 € 906
Equity instruments [Member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems      
Equity Instruments, gains (losses) on financial instruments (253) 845 459
Loans and advances [Member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems      
Equity Instruments, gains (losses) on financial instruments (172) 97 65
Derivatives [Member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems      
Equity Instruments, gains (losses) on financial instruments 927 (470) 109
Customer Deposits [Member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems      
Equity Instruments, gains (losses) on financial instruments 240 (96) 87
Other [Member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems      
Equity Instruments, gains (losses) on financial instruments 137 18 35
Total [Member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems      
Equity Instruments, gains (losses) on financial instruments € 1,233 € 938 € 1,661