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Note 7 - Risk Management - Guaranteed financial instruments based on IFRS9 (Details) - EUR (€)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Maximun Credit Risk Exposure [Member]      
Impaired Financial Assets At Amortised Cost Line Items      
Impaired Financial Assets At Amortised Cost € 14,678,000,000 € 15,959,000,000 € 16,359,000,000
of which guaranteed [Member] | Residential Mortgage [Member]      
Impaired Financial Assets At Amortised Cost Line Items      
Impaired Financial Assets At Amortised Cost 2,717,000,000 3,396,000,000 3,484,000,000
of which guaranteed [Member] | Commerce Mortgage [Member]      
Impaired Financial Assets At Amortised Cost Line Items      
Impaired Financial Assets At Amortised Cost 789,000,000 939,000,000 1,255,000,000
of which guaranteed [Member] | Cash [Member]      
Impaired Financial Assets At Amortised Cost Line Items      
Impaired Financial Assets At Amortised Cost 18,000,000 35,000,000 13,000,000
of which guaranteed [Member] | Other [Member]      
Impaired Financial Assets At Amortised Cost Line Items      
Impaired Financial Assets At Amortised Cost 52,000,000 221,000,000 317,000,000
of which guaranteed [Member] | Funds [Member]      
Impaired Financial Assets At Amortised Cost Line Items      
Impaired Financial Assets At Amortised Cost € 575,000,000 € 542,000,000 € 502,000,000