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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Interest Income And Expense      
Central banks Interest Expense (Interest Expense) € (80) € (123) € (192)
Deposits from credit institutions Interest Expenses (Interest Expense) (2,023) (1,880) (1,367)
Customer deposits Interest Expenses(Interest Expense) (6,523) (5,814) (5,766)
Debt instruments Issued interest expenses(Interest Expense) (1,936) (1,930) (2,323)
Total Adjustments of expenses as a result of hedging transactions (Interest Expense) 323 (665) 574
Cash flows hedges interest expenses (Interest Expense) (46) (38) (42)
Fair value hedges interest expenses (Interest Expense) 368 (627) 616
Interest and similar expenses (119) (125) (96)
Insurance activity interest expense (Interest Expense) (607) (682) (846)
Other expenses interest expenses(Interest Expense) (1,274) (316) (634)
Total Interest Expenses (Income Statement) € (12,239) € (11,537) € (10,648)