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Note 22 - Financial liabilities at amortized cost - Deposits from credit institutions (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deposits From Banks [Line Items]      
Deposits from credit institutions € 31,978 € 54,516 € 63,501
Deposits With Agreed Maturity [Member]      
Deposits From Banks [Line Items]      
Deposits from credit institutions 19,015 25,941 30,429
Demand Deposits [Member]      
Deposits From Banks [Line Items]      
Deposits from credit institutions 8,370 3,731 4,651
Repurchase Agreements [Member]      
Deposits From Banks [Line Items]      
Deposits from credit institutions € 4,593 € 24,843 € 28,420