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Note 41 Gains Or Losses On Financial Assets And Liabilities And Exchange Differences Breakdown By Heading On the Balance Sheet (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Gains Or Losses On Financial Assets And Liabilities And Exchange Differences Breakdown By Heading On the Balance Sheet [Line Items]      
Gains or losses on derecognition of financial assets and liabilities not measured at fair value through profit or loss net € 327 € 76 € 64
Gains Losses On Derecognition Of Financial Assets At Amortized Cost 20 41 8
Gains Losses On Derecognition Of Other Financial Assets And Liabilities 307 35 56
Gains or losses on financial assets and liabilities held for trading net 2,458 1,352 562
Reclassification Of Financial Assets From Fair Value Through Other Comprehensive Income To Held For Trading 0 0 0
Reclassification Of Financial Assets From Amortized Cost To Held For Trading 0 0 0
Reclassification Of Other Gains Losses To Held For Trading 2,458 1,352 562
Gains (losses) on financial assets at fair value through profit or loss, mandatorily measured at fair value 179 337 (67)
Reclassification Of Financial Assets From Fair Value Through Other Comprehensive Income To Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss 0 0 0
Reclassification Of Financial Assets From Amortized Cost To Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss 0 0 0
Reclassification Of Other Gains Losses To Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss 179 337 (67)
Gains or losses on financial assets and liabilities designated at fair value through profit or loss net 249 96 150
Gain (loss) on hedge ineffectiveness recognised in profit or loss 5 (17) (45)
Subtotal gains or losses in financial assets and liabilities net 3,218 1,844 663
Foreign exchange gain (loss) 695 339 1,275
Gains (losses) on financial assets and liabilities, hedge accounting and exchange differences € 3,913 € 2,183 € 1,938