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Note 13 - Financial assets at amortised cost - Financial assets at amortised cost (Details) - EUR (€)
€ in Millions
Jun. 30, 2018
Dec. 31, 2017
Disclosure Of Financial Assets At Amortised Cost Line Items    
Debt Securities Financial Assets at Amortized Cost € 32,082 € 24,093
Loans and advances to central banks 5,309 7,300
Loans and advances to banks 11,783 26,261
Loans and Advances to customers 377,175 387,621
Total Financial Assets At Amortised Cost 426,349 445,275
Total [Member]    
Disclosure Of Financial Assets At Amortised Cost Line Items    
Debt Securities Financial Assets at Amortized Cost 32,082 24,093
Loans and advances to central banks 5,309 7,300
Loans and advances to banks 11,783 26,261
Loans and Advances to customers 377,175 387,621
Of which impairment losses [Member]    
Disclosure Of Financial Assets At Amortised Cost Line Items    
Debt Securities Financial Assets at Amortized Cost (30) (15)
Loans and advances to central banks (2) 0
Loans and advances to banks (13) (36)
Loans and Advances to customers (13,486) (12,748)
Government [Member]    
Disclosure Of Financial Assets At Amortised Cost Line Items    
Loans and Advances to customers 28,785 31,645
Financial societies [Member]    
Disclosure Of Financial Assets At Amortised Cost Line Items    
Loans and Advances to customers 8,607 18,173
Non financial societies [Member]    
Disclosure Of Financial Assets At Amortised Cost Line Items    
Loans and Advances to customers 165,828 164,510
Rest of clients [Member]    
Disclosure Of Financial Assets At Amortised Cost Line Items    
Loans and Advances to customers € 173,956 € 173,293