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Note 10 - Financial assets and liabilities held for trading - Deposits (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial Liabilities Held fo rTrading Deposits Line Items      
Deposits from central banks, held for trading € 10,511 € 0 € 0
Deposits from credit institutions, held for trading 15,687 0 0
Customer deposits, held for trading 11,736 0 0
Financial Liabilities Held For Trading 80,774 € 46,182 € 54,675
Total [Member]      
Financial Liabilities Held fo rTrading Deposits Line Items      
Deposits from central banks, held for trading 10,511    
Deposits from credit institutions, held for trading 15,687    
Customer deposits, held for trading 11,736    
Financial Liabilities Held For Trading 37,934    
Repurchase Agreements [Member]      
Financial Liabilities Held fo rTrading Deposits Line Items      
Deposits from central banks, held for trading 10,511    
Deposits from credit institutions, held for trading 14,839    
Customer deposits, held for trading € 11,466