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Note 21 - Financial liabilities at amortized cost - Deposits from customers (Details) - EUR (€)
€ in Millions
Jun. 30, 2018
Dec. 31, 2017
Deposits From Customers [Line Items]    
Customer deposits € 367,312 € 376,379
General Government [Member]    
Deposits From Customers [Line Items]    
Customer deposits 25,576 23,210
Demand Deposits [Member]    
Deposits From Customers [Line Items]    
Customer deposits 230,248 223,497
Savings Accounts [Member]    
Deposits From Customers [Line Items]    
Customer deposits 105,839 116,538
Repurchase Agreements [Member]    
Deposits From Customers [Line Items]    
Customer deposits 1,488 9,076
Subordinated Accounts [Member]    
Deposits From Customers [Line Items]    
Customer deposits 201 194
Other Accounts [Member]    
Deposits From Customers [Line Items]    
Customer deposits 3,960 3,864
Total [Member]    
Deposits From Customers [Line Items]    
Customer deposits 367,312 376,379
Total [Member] | Of Which: Domestic currency deposits from customers [Member]    
Deposits From Customers [Line Items]    
Customer deposits 179,294 184,150
Total [Member] | Of Which: Foreign currency deposits from customers [Member]    
Deposits From Customers [Line Items]    
Customer deposits € 188,018 € 192,229