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Note 37 - Interest Income and Expense - Interest Expense Break Down By Origin (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Interest Income And Expense      
Central banks Interest Expense (Interest Expense) € 123 € 192 € 138
Deposits from credit institutions Interest Expenses (Interest Expense) 1,880 1,367 1,186
Customer deposits Interest Expenses(Interest Expense) 5,814 5,766 4,340
Debt instruments Issued interest expenses(Interest Expense) 1,930 2,323 2,548
Adjustments of expenses as a result of hedging transactions (Interest Expense) 665 (574) (859)
Cash flows hedges interest expenses (Interest Expense) 38 42 (16)
Fair value hedges interest expenses (Interest Expense) 627 (616) (844)
Interest and similar expenses 125 96 108
Insurance activity interest expense (Interest Expense) 682 846 816
Other expenses interest expenses(Interest Expense) 316 634 484
Interest Expenses (Income Statement) € 11,537 € (10,648) € 8,761