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Note 21 - Financial liabilities at amortized cost - Deposits from credit institutions (Details) - EUR (€)
€ in Millions
Jun. 30, 2018
Dec. 31, 2017
Deposits From Banks [Line Items]    
Deposits from credit institutions € 33,307 € 54,516
Deposits With Agreed Maturity [Member]    
Deposits From Banks [Line Items]    
Deposits from credit institutions 18,616 25,941
Demand Deposits [Member]    
Deposits From Banks [Line Items]    
Deposits from credit institutions 9,745 3,731
Repurchase Agreements [Member]    
Deposits From Banks [Line Items]    
Deposits from credit institutions 4,946 24,843
Other Accounts [Member]    
Deposits From Banks [Line Items]    
Deposits from credit institutions € 0 € 0