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Note 6 - Risk Management - Guaranteed financial instruments based on IFRS9 (Details) - EUR (€)
Jun. 30, 2020
Dec. 31, 2019
Impaired Financial Assets At Amortised Cost Line Items    
Impaired Financial Assets At Amortised Cost € 213,425,000,000 € 187,918,000,000
Real Guarantees [Member]    
Impaired Financial Assets At Amortised Cost Line Items    
Impaired Financial Assets At Amortised Cost 157,585,000,000 152,454,000,000
Real Guarantees [Member] | Of Which Normal Risk [Member]    
Impaired Financial Assets At Amortised Cost Line Items    
Impaired Financial Assets At Amortised Cost 14,983,000,000 14,623,000,000
Real Guarantees [Member] | Of Which Doubtful Risk [Member]    
Impaired Financial Assets At Amortised Cost Line Items    
Impaired Financial Assets At Amortised Cost 4,204,000,000 4,590,000,000
Other guarantees [Member]    
Impaired Financial Assets At Amortised Cost Line Items    
Impaired Financial Assets At Amortised Cost 55,840,000,000 35,464,000,000
Other guarantees [Member] | Of Which Normal Risk [Member]    
Impaired Financial Assets At Amortised Cost Line Items    
Impaired Financial Assets At Amortised Cost 4,239,000,000 3,306,000,000
Other guarantees [Member] | Of Which Doubtful Risk [Member]    
Impaired Financial Assets At Amortised Cost Line Items    
Impaired Financial Assets At Amortised Cost € 559,000,000 € 542,000,000