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Note 36 Gains Or Losses On Financial Assets And Liabilities And Exchange Differences Breakdown By Nature Of The Financial Instrument (Details) - EUR (€)
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]    
Gains (losses) on financial assets and liabilities € 878,000,000 € 838,000,000
Debt securities [Member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]    
Gains (losses) on financial assets and liabilities 47,000,000 625,000,000
Equity investments [member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]    
Gains (losses) on financial assets and liabilities 1,207,000,000 (1,374,000,000)
Derivatives [member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]    
Gains (losses) on financial assets and liabilities (810,000,000) 1,309,000,000
loans and advances [Member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]    
Gains (losses) on financial assets and liabilities 85,000,000 117,000,000
Customer deposits [Member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]    
Gains (losses) on financial assets and liabilities 42,000,000 (8,000,000)
Other [Member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]    
Gains (losses) on financial assets and liabilities € 307,000,000 € 169,000,000