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Note 42 Impairment Or Reversal Of Impairment On Financial Assets Not Measured At Fair Value Through Profit Or Loss (Details) - EUR (€)
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Disclosure of Impairment or reversal of impairment on financial assets not measured at fair value through profit or loss [Line Items]    
Financial assets measured at cost impairment or reversal of impairment € (8,000,000) € 70,000,000
Impairment Financial Assets At Amortised Cost [1] 1,587,000,000 3,502,000,000
Gain on recovery of loans and advances previously written off (225,000,000) (145,000,000)
Impairment loss on financial assets € 1,580,000,000 € 3,572,000,000
[1] (*) As of June 30, 2020 the amount includes mainly the negative impact of the update of the macroeconomic scenario following the COVID-19 pandemic (See Note 6.2).