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Note 37 - Interest Income and Expense - Average Return On Investments And Average Borrowing Cost Assets (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Average Return On Investments Assets Line Items |  |  |
Interest Income (Income Statement) | € 29,296 | € 27,708 | € 24,783
Cash And Balances With Central Banks And Other Demand Deposits [Member] |  |  |
Average Return On Investments Assets Line Items |  |  |
Average Balance | 33,917 | 26,209 | 23,542
Interest Income (Income Statement) | € 83 | € 10 | € 2
Average Interest Rate Percentage | 0.25 | 0.04 | 0.01
Securities Portfolio And Derivatives [Member] |  |  |
Average Return On Investments Assets Line Items |  |  |
Average Balance | € 177,164 | € 202,388 | € 211,589
Interest Income (Income Statement) | € 4,724 | € 5,072 | € 4,673
Average Interest Rate Percentage | 2.67 | 2.51 | 2.21
Loans And Advances To Central Banks [Member] |  |  |
Average Return On Investments Assets Line Items |  |  |
Average Balance | € 10,945 | € 15,326 | € 12,004
Interest Income (Income Statement) | € 258 | € 229 | € 140
Average Interest Rate Percentage | 2.36 | 1.50 | 1.17
Loans And Advances To Credit Institutions [Member] |  |  |
Average Return On Investments Assets Line Items |  |  |
Average Balance | € 26,420 | € 28,078 | € 27,171
Interest Income (Income Statement) | € 485 | € 218 | € 270
Average Interest Rate Percentage | 1.83 | 0.78 | 0.99
Loans And Advances To Customer [Member] |  |  |
Average Return On Investments Assets Line Items |  |  |
Average Balance | € 407,153 | € 410,895 | € 382,125
Interest Income (Income Statement) | € 23,261 | € 21,853 | € 19,471
Average Interest Rate Percentage | 5.71 | 5.32 | 5.10
Loans And Advances To Customers Euros [Member] |  |  |
Average Return On Investments Assets Line Items |  |  |
Average Balance | € 196,893 | € 201,967 | € 196,987
Interest Income (Income Statement) | € 3,449 | € 3,750 | € 4,301
Average Interest Rate Percentage | 1.75 | 1.86 | 2.18
Loans And Advances To Customers Foreign Currency [Member] |  |  |
Average Return On Investments Assets Line Items |  |  |
Average Balance | € 210,261 | € 208,928 | € 185,139
Interest Income (Income Statement) | € 19,812 | € 18,104 | € 15,170
Average Interest Rate Percentage | 9.42 | 8.67 | 8.19
Other Assets [Member] |  |  |
Average Return On Investments Assets Line Items |  |  |
Average Balance | € 48,872 | € 52,748 | € 49,128
Interest Income (Income Statement) | € 485 | € 325 | € 226
Average Interest Rate Percentage | 0.99 | 0.62 | 0.46
Total [Member] |  |  |
Average Return On Investments Assets Line Items |  |  |
Average Balance | € 704,471 | € 735,645 | € 705,559
Interest Income (Income Statement) | € 29,296 | € 27,708 | € 24,783
Average Interest Rate Percentage | 4.16 | 3.77 | 3.51

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