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Note 35 Gains or losses on financial assets and liabilities breakdown by nature of the financial instrument (Details) - EUR (€)
€ in Millions
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]    
Gains (losses) on financial assets and liabilities € 469 € 379
Debt securities [Member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]    
Gains (losses) on financial assets and liabilities 259 (1,354)
Equity investments [member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]    
Gains (losses) on financial assets and liabilities 467 (1,224)
Derivatives [member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]    
Gains (losses) on financial assets and liabilities (865) 1,189
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 46 (100)
Customer deposits [Member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]    
Gains (losses) on financial assets and liabilities (17) 179
Other [Member]    
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]    
Gains (losses) on financial assets and liabilities € 579 € 1,690