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Note 32 - Interest Income and Expense - Interest Income And Expenses Change In The Balance (Details) - EUR (€)
€ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash And Balances With Central Banks And Other Demand Deposits [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect € 1 [1] € 2 [2]
Interest Income Expense Price Effect 48 [3] (1) [4]
Interest Income Expense Total Effect 49 1
Securities Portfolio And Derivatives [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect 150 [1] (306) [2]
Interest Income Expense Price Effect (339) [3] 185 [4]
Interest Income Expense Total Effect (189) (120)
Loans And Advances To Central Banks [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (68) [1] (28) [2]
Interest Income Expense Price Effect 41 [3] 77 [4]
Interest Income Expense Total Effect (27) 50
Loans And Advances To Credit Institutions [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (73) [1] (11) [2]
Interest Income Expense Price Effect 256 [3] (7) [4]
Interest Income Expense Total Effect 183 (19)
Loans And Advances To Customer [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (757) [1] (15) [2]
Interest Income Expense Price Effect 1,054 [3] 572 [4]
Interest Income Expense Total Effect 297 557
Loans And Advances To Customers Euros [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (127) [1] (64) [2]
Interest Income Expense Price Effect 89 [3] (140) [4]
Interest Income Expense Total Effect (38) (204)
Loans And Advances To Customers Foreign Currency [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (581) [1] 263 [2]
Interest Income Expense Price Effect 916 [3] 498 [4]
Interest Income Expense Total Effect 335 761
Other Assets [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (23) [1] (6) [2]
Interest Income Expense Price Effect (88) [3] 140 [4]
Interest Income Expense Total Effect (111) 134
Interest Income Member [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Total Effect 202 603
Deposits From Central Banks And Credit Institutions [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (262) [5] (87) [6]
Interest Income Expense Price Effect 464 [7] 73 [8]
Interest Income Expense Total Effect 202 (14)
Customer Depositis [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (188) [5] (68) [6]
Interest Income Expense Price Effect 693 [7] 65 [8]
Interest Income Expense Total Effect 505 (3)
Customers Deposits Euros [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (13) [5] (36) [6]
Interest Income Expense Price Effect (65) [7] (139) [8]
Interest Income Expense Total Effect (78) (175)
Customers Deposits Foreign Currency [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (199) [5] 109 [6]
Interest Income Expense Price Effect 782 [7] 63 [8]
Interest Income Expense Total Effect 583 172
Debt Securities Issued [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect (80) [5] (39) [6]
Interest Income Expense Price Effect 77 [7] 28 [8]
Interest Income Expense Total Effect (4) (11)
Other liabilities [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Volume Effect 217 [5] (23) [6]
Interest Income Expense Price Effect (559) [7] 215 [8]
Interest Income Expense Total Effect (341) 192
Interest Expenses    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Total Effect 362 164
Total [Member]    
Interest Income Expemse Change Balance Line Items    
Interest Income Expense Total Effect € (160) € 438
[1]

(1) The 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]

(1) The 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.

[3]

(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.

[4]

(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.

[5]

(1) The 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.

[6]

(1) The 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.

[7]

(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.

[8]

(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.