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Note 37 - Interest Income and Expense - Interest Income And Expenses Change In The Balance (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash And Balances With Central Banks And Other Demand Deposits [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect € 22 [1] € 3
Interest Income Expense Price Effect 30 [2] 71
Interest Income Expense Total Effect 51 74
Securities Portfolio And Derivatives [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect 67 [1] (632)
Interest Income Expense Price Effect 916 [2] 285
Interest Income Expense Total Effect 983 (347)
Loans And Advances To Central Banks [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (128) [1] (66)
Interest Income Expense Price Effect 128 [2] 94
Interest Income Expense Total Effect 0 29
Loans And Advances To Credit Institutions [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (14) [1] (13)
Interest Income Expense Price Effect 187 [2] 279
Interest Income Expense Total Effect 172 266
Loans And Advances To Customer [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (1,609) [1] (199)
Interest Income Expense Price Effect 1,152 [2] 1,606
Interest Income Expense Total Effect (456) 1,408
Loans And Advances To Customers Euros [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (267) [1] (94)
Interest Income Expense Price Effect 199 [2] (206)
Interest Income Expense Total Effect (68) (301)
Loans And Advances To Customers Foreign Currency [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (1,219) [1] 115
Interest Income Expense Price Effect 830 [2] 1,593
Interest Income Expense Total Effect (389) 1,708
Other Assets [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (25) [1] (24)
Interest Income Expense Price Effect (190) [2] 184
Interest Income Expense Total Effect (215) 160
Interest Income [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect 0 [1] 0
Interest Income Expense Price Effect 0 [2] 0
Interest Income Expense Total Effect 535 1,588
Deposits From Central Banks And Credit Institutions [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (624) [1] (208)
Interest Income Expense Price Effect 604 [2] 554
Interest Income Expense Total Effect (20) 346
Customer Depositis [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (393) [1] (101)
Interest Income Expense Price Effect (55) [2] 1,164
Interest Income Expense Total Effect (448) 1,063
Customers Deposits Euros [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (20) [1] (35)
Interest Income Expense Price Effect (104) [2] (269)
Interest Income Expense Total Effect (124) (305)
Customers Deposits Foreign Currency [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (448) [1] 57
Interest Income Expense Price Effect 124 [2] 1,311
Interest Income Expense Total Effect (324) 1,368
Debt Securities Issued [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (161) [1] (109)
Interest Income Expense Price Effect 282 [2] 3
Interest Income Expense Total Effect 122 (106)
Other liabilities [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect 274 [1] (82)
Interest Income Expense Price Effect 774 [2] (332)
Interest Income Expense Total Effect 1,048 (414)
Interest Expenses    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect 0 0
Interest Income Expense Price Effect 0 0
Interest Income Expense Total Effect 702  
Total [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect 0 0
Interest Income Expense Price Effect 0 0
Interest Income Expense Total Effect € (167) € 699
[1]

(1) T he volume effect is calculated as the result of the interest rate of the initial period multiplied by the difference between the average balances of both periods.

[2]

(2) The price effect is calculated as the result of the average balance of the last period multiplied by the difference between the interest rates of both periods.