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Note 36 Gains Or Losses On Financial Assets And Liabilities And Exchange Differences Breakdown By Heading On the Balance Sheet (Details) - EUR (€)
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
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 Available For Sale Financial AssetsLoss Net € 121,000,000 € 202,000,000
GainsOrLossesOnDerecognition Of Financial Assets And Liabilities Not Measured At Fair Value Through Profit Or Loss Net Available For Sale Financial Assets 5,000,000 102,000,000
Gains Or Losses On Derecognition Of Financial Assets And Liabilities Not Measured At Fair Value Through Profit Or Loss Net Other 115,000,000 100,000,000
Gains Losses On Financial Assets And Liabilities At Fair Value Through Profit Or Loss Classified As Held For Trading 463,000,000 270,000,000
Gains Losses On Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss 280,000,000 129,000,000
Gains Losses On Financial Assets At Fair Value Through Profit Or Loss 96,000,000 203,000,000
Gains (losses) on hedging instrument, fair value hedges (81,000,000) 35,000,000
Subtotal gains or losses in financial assets and liabilities net 878,000,000 838,000,000
Gains or losses on net exchange differences 206,000,000 176,000,000
Gains Or Losses In Financial Assets And Liabilities € 1,084,000,000 € 1,013,000,000