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Note 7 - Risk Management - Market Risk (Details) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | € 22 | € 26 | € 24
Interest Rate [Member] | Weighted Average [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 25 | 28 |
Interest Rate [Member] | Maximum [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 27 | 30 | 32
Interest Rate [Member] | Minimun [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 23 | 21 | 20
Interest Rate [Member] | Closing date [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 23 | 29 | 21
Currency Risk [Member] | Weighted Average [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 10 | 10 |
Currency Risk [Member] | Maximum [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 11 | 16 | 5
Currency Risk [Member] | Minimun [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 7 | 10 | 6
Currency Risk [Member] | Closing date [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 7 | 7 | 9
Stock Market Risk [Member] | Weighted Average [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 3 | 4 |
Stock Market Risk [Member] | Maximum [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 2 | 4 | 3
Stock Market Risk [Member] | Minimun [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 4 | 1 | 3
Stock Market Risk [Member] | Closing date [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 4 | 2 | 3
Vega Correlation Risk [Member] | Weighted Average [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 13 | 11 |
Vega Correlation Risk [Member] | Maximum [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 12 | 11 | 9
Vega Correlation Risk [Member] | Minimun [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 14 | 11 | 9
Vega Correlation Risk [Member] | Closing date [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 14 | 12 | 11
Diversification Effect [Member] | Weighted Average [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | (23) | (23) |
Diversification Effect [Member] | Maximum [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | (19) | (23) | (18)
Diversification Effect [Member] | Minimun [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | (26) | (20) | (17)
Diversification Effect [Member] | Closing date [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk | [1] | (26) | (24) | (20)
Total [Member] | Weighted Average [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 27 | 29 | 24
Total [Member] | Maximum [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 34 | 38 | 30
Total [Member] | Minimun [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 22 | 23 | 21
Total [Member] | Closing date [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | € 22 | € 26 | € 24
[1] | (*) The diversification effect is the difference between the sum of the average individual risk factors and the total VaR figure that includes the implied correlation between all the variables and scenarios used in the measurement.

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- Definition The measure of a potential loss exposure as a result of future market movements, based on a specified confidence interval and measurement horizon. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2016-01-13 -Paragraph 41 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_41&doctype=Standard -URIDate 2016-03-31 + Details
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