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Note 7 - Risk Management - Guaranteed financial instruments based on IFRS9 (Details)
€ in Millions
Dec. 31, 2018
EUR (€)
Maximun Credit Risk Exposure [Member] | Total [Member]  
Impaired Financial Assets At Amortised Cost Line Items  
Impaired Financial Assets At Amortised Cost € 16,394
of which guaranteed [Member] | Residential Mortgage [Member]  
Impaired Financial Assets At Amortised Cost Line Items  
Impaired Financial Assets At Amortised Cost 3,484
of which guaranteed [Member] | Commerce Mortgage [Member]  
Impaired Financial Assets At Amortised Cost Line Items  
Impaired Financial Assets At Amortised Cost 1,255
of which guaranteed [Member] | Cash [Member]  
Impaired Financial Assets At Amortised Cost Line Items  
Impaired Financial Assets At Amortised Cost 13
of which guaranteed [Member] | Other [Member]  
Impaired Financial Assets At Amortised Cost Line Items  
Impaired Financial Assets At Amortised Cost 317
of which guaranteed [Member] | Funds [Member]  
Impaired Financial Assets At Amortised Cost Line Items  
Impaired Financial Assets At Amortised Cost € 502