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Note 41 Gains Or Losses On Financial Assets And Liabilities And Exchange Differences Breakdown By Nature Of The Financial Instrument (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]      
Gains (losses) on financial assets and liabilities € 1,027 € 1,187 € 705
Debt securities [Member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]      
Gains (losses) on financial assets and liabilities 158 848 945
Equity investments [member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]      
Gains (losses) on financial assets and liabilities 2,059 (28) 1,336
Derivatives [member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]      
Gains (losses) on financial assets and liabilities (1,866) 277 (1,133)
Loans and advances to customers [Member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]      
Gains (losses) on financial assets and liabilities 100 128 78
Customer deposits [Member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]      
Gains (losses) on financial assets and liabilities 55 (79) (26)
Other [Member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]      
Gains (losses) on financial assets and liabilities € 522 € 42 € (497)