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Note 22 - Financial liabilities at amortized cost - Deposits from customers (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deposits From Customers [Line Items]      
Customer deposits € 375,970 € 376,379 € 401,465
General Government [Member] | Of Which: Domestic currency deposits from customers [Member]      
Deposits From Customers [Line Items]      
Customer deposits 26,459 23,210 21,396
Demand Deposits [Member] | Of Which: Domestic currency deposits from customers [Member]      
Deposits From Customers [Line Items]      
Customer deposits 238,907 223,497 212,604
Savings Accounts [Member] | Of Which: Domestic currency deposits from customers [Member]      
Deposits From Customers [Line Items]      
Customer deposits 105,257 116,538 153,388
Repurchase Agreements [Member] | Of Which: Domestic currency deposits from customers [Member]      
Deposits From Customers [Line Items]      
Customer deposits 1,207 9,076 13,514
Subordinated Accounts [Member] | Of Which: Domestic currency deposits from customers [Member]      
Deposits From Customers [Line Items]      
Customer deposits 220 194 233
Other Accounts [Member] | Of Which: Domestic currency deposits from customers [Member]      
Deposits From Customers [Line Items]      
Customer deposits 3,920 3,864 330
Total [Member]      
Deposits From Customers [Line Items]      
Customer deposits 375,970 376,379 401,465
Total [Member] | Of Which: Domestic currency deposits from customers [Member]      
Deposits From Customers [Line Items]      
Customer deposits 184,934 184,150 189,438
Total [Member] | Of Which: Foreign currency deposits from customers [Member]      
Deposits From Customers [Line Items]      
Customer deposits € 191,036 € 192,229 € 212,027