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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
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Average Return On Investments Liabilities Line Items |  |  |
Interest Expenses (Income Statement) | € (12,239) | € (11,537) | € (10,648)
Deposits From Central Banks And Credit Institutions [Member] |  |  |
Average Return On Investments Liabilities Line Items |  |  |
Return On Investment Average Balance | 65,044 | 90,619 | 101,975
Interest Expenses (Income Statement) | € 2,192 | € 2,212 | € 1,866
Return On Investment Average Interest Rate Percentage | 3.37 | 2.44 | 1.83
Customer Depositis [Member] |  |  |
Average Return On Investments Liabilities Line Items |  |  |
Return On Investment Average Balance | € 370,078 | € 392,057 | € 398,851
Interest Expenses (Income Statement) | € 6,559 | € 7,007 | € 5,944
Return On Investment Average Interest Rate Percentage | 1.77 | 1.79 | 1.49
Customers Deposits Euros [Member] |  |  |
Average Return On Investments Liabilities Line Items |  |  |
Return On Investment Average Balance | € 178,370 | € 186,261 | € 195,310
Interest Expenses (Income Statement) | € 337 | € 461 | € 766
Return On Investment Average Interest Rate Percentage | 0.19 | 0.25 | 0.39
Customers Deposits Foreign Currency [Member] |  |  |
Average Return On Investments Liabilities Line Items |  |  |
Return On Investment Average Balance | € 191,709 | € 205,796 | € 203,541
Interest Expenses (Income Statement) | € 6,222 | € 6,546 | € 5,178
Return On Investment Average Interest Rate Percentage | 3.25 | 3.18 | 2.54
Debt Securities Issued [Member] |  |  |
Average Return On Investments Liabilities Line Items |  |  |
Return On Investment Average Balance | € 75,927 | € 84,221 | € 89,876
Interest Expenses (Income Statement) | € 1,753 | € 1,631 | € 1,738
Return On Investment Average Interest Rate Percentage | 2.31 | 1.94 | 1.93
Other liabilities [Member] |  |  |
Average Return On Investments Liabilities Line Items |  |  |
Return On Investment Average Balance | € 115,638 | € 82,699 | € 89,328
Interest Expenses (Income Statement) | € 1,735 | € 687 | € 1,101
Return On Investment Average Interest Rate Percentage | 1.50 | 0.83 | 1.23
Equity [Member] |  |  |
Average Return On Investments Liabilities Line Items |  |  |
Return On Investment Average Balance | € 52,206 | € 54,874 | € 55,616
Interest Expenses (Income Statement) | € 0 | € 0 | € 0
Return On Investment Average Interest Rate Percentage | - | - | -
Total [Member] |  |  |
Average Return On Investments Liabilities Line Items |  |  |
Return On Investment Average Balance | € 678,893 | € 704,471 | € 735,645
Interest Expenses (Income Statement) | € 12,239 | € 11,537 | € 10,648
Return On Investment Average Interest Rate Percentage | 1.80 | 1.64 | 1.45

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