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Note 14 - Financial assets at amortised cost - Financial assets at amortised cost (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Financial Assets At Amortised Cost Line Items      
Debt Securities Financial Assets at Amortized Cost € 32,530 € 24,093 € 28,905
Loans and advances to central banks 3,941 7,300 8,894
Loans and advances to banks 9,163 26,261 31,373
Loans and Advances to customers 374,027 387,621 414,500
Total [Member]      
Disclosure Of Financial Assets At Amortised Cost Line Items      
Debt Securities Financial Assets at Amortized Cost 32,530 24,093 28,905
Loans and advances to central banks 3,941 7,300 8,894
Loans and advances to banks 9,163 26,261 31,373
Loans and Advances to customers 374,027 387,621 414,500
Total Financial Assets At Amortised Cost 419,660 445,275 € 483,672
Government [Member]      
Disclosure Of Financial Assets At Amortised Cost Line Items      
Loans and Advances to customers 28,114 31,645  
Financial societies [Member]      
Disclosure Of Financial Assets At Amortised Cost Line Items      
Loans and Advances to customers 9,468 18,173  
Non financial societies [Member]      
Disclosure Of Financial Assets At Amortised Cost Line Items      
Loans and Advances to customers 163,922 164,510  
Rest of clients [Member]      
Disclosure Of Financial Assets At Amortised Cost Line Items      
Loans and Advances to customers € 172,522 € 173,293