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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]      
Gains (losses) on financial assets and liabilities € 663 € 1,027 € 1,187
Debt securities [Member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]      
Gains (losses) on financial assets and liabilities (2,266) 158 848
Equity investments [member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]      
Gains (losses) on financial assets and liabilities (1,099) 2,059 (28)
Derivatives [member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]      
Gains (losses) on financial assets and liabilities 1,361 (1,866) 277
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 (241) 100 128
Customer deposits [Member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]      
Gains (losses) on financial assets and liabilities 274 55 (79)
Other [Member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]      
Gains (losses) on financial assets and liabilities € 2,635 € 522 € 42