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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]      
Gains (losses) on financial assets and liabilities € 3,218 € 1,844 € 663
Debt securities [Member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]      
Gains (losses) on financial assets and liabilities 841 799 (2,266)
Equity investments [member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]      
Gains (losses) on financial assets and liabilities 553 669 (1,099)
Derivatives [member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]      
Gains (losses) on financial assets and liabilities 181 (812) 1,361
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 236 165 (241)
Customer deposits [Member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]      
Gains (losses) on financial assets and liabilities (81) (95) 274
Other [Member]      
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument [Line Items]      
Gains (losses) on financial assets and liabilities € 1,488 € 1,118 € 2,635