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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 (€)
Jun. 30, 2020
Jun. 30, 2019
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems    
Equity Instruments, gains (losses) on financial instruments € 790,000,000 € 408,000,000
Debt Securities [Member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems    
Equity Instruments, gains (losses) on financial instruments 646,000,000 451,000,000
Equity instruments [Member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems    
Equity Instruments, gains (losses) on financial instruments (1,374,000,000) 764,000,000
Derivatives [Member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems    
Equity Instruments, gains (losses) on financial instruments 1,384,000,000 (653,000,000)
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 119,000,000 92,000,000
Customer Deposits [Member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems    
Equity Instruments, gains (losses) on financial instruments (9,000,000) 32,000,000
Other [Member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems    
Equity Instruments, gains (losses) on financial instruments € 25,000,000 € (277,000,000)