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Note 36 - Gains (losses) on financial assets and liabilities (net) and Exchange Differences - Breakdown by nature of the financial instrument (Details) - EUR (€)
€ in Millions
Jun. 30, 2018
Jun. 30, 2017
Debt Securities [Member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems    
Equity Instruments, gains (losses) on financial instruments € 222 € 448
Equity instruments [Member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems    
Equity Instruments, gains (losses) on financial instruments 33 546
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 (85) 44
Derivatives [Member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems    
Equity Instruments, gains (losses) on financial instruments 186 (410)
Customer Deposits [Member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems    
Equity Instruments, gains (losses) on financial instruments 219 (97)
Other [Member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems    
Equity Instruments, gains (losses) on financial instruments 42 10
Total [Member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems    
Equity Instruments, gains (losses) on financial instruments € 618 € 541