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Note 37 - Interest Income and Expense - Average Return On Investments And Average Borrowing Cost Liabilities (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Average Return On Investments Liabilities Line Items |  |  |
Interest Expenses (Income Statement) | € 11,537 | € (10,648) | € 8,761
Deposits From Central Banks And Credit Institutions [Member] |  |  |
Average Return On Investments Liabilities Line Items |  |  |
Average Balance | 90,619 | 101,975 | 99,289
Interest Expenses (Income Statement) | 2,212 | 1,866 | 1,559
Customer Depositis [Member] |  |  |
Average Return On Investments Liabilities Line Items |  |  |
Average Balance | 392,057 | 398,851 | 366,249
Interest Expenses (Income Statement) | 7,007 | 5,944 | 4,390
Customers Deposits Euros [Member] |  |  |
Average Return On Investments Liabilities Line Items |  |  |
Average Balance | 186,261 | 195,310 | 187,721
Interest Expenses (Income Statement) | 461 | 766 | 1,024
Customers Deposits Foreign Currency [Member] |  |  |
Average Return On Investments Liabilities Line Items |  |  |
Average Balance | 205,796 | 203,541 | 178,528
Interest Expenses (Income Statement) | 6,546 | 5,178 | 3,366
Debt Securities Issued [Member] |  |  |
Average Return On Investments Liabilities Line Items |  |  |
Average Balance | 84,221 | 89,876 | 89,672
Interest Expenses (Income Statement) | 1,631 | 1,738 | 1,875
Other liabilities [Member] |  |  |
Average Return On Investments Liabilities Line Items |  |  |
Average Balance | 82,699 | 89,328 | 96,049
Interest Expenses (Income Statement) | 687 | 1,101 | 936
Equity [Member] |  |  |
Average Return On Investments Liabilities Line Items |  |  |
Average Balance | 54,874 | 55,616 | 54,300
Interest Expenses (Income Statement) | 0 | 0 | 0
Total [Member] |  |  |
Average Return On Investments Liabilities Line Items |  |  |
Average Balance | 704,471 | 735,645 | 705,559
Interest Expenses (Income Statement) | € 11,537 | € 10,648 | € 8,761

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