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Note 7 - Risk Management - Market Risk (Details) - EUR (€) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Interest Rate Risk Member | Weighted average [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | € 29,000,000 | € 21,000,000 | € 20,000,000
Interest Rate Risk Member | Maximum Member |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 39,000,000 | 28,000,000 | 23,000,000
Interest Rate Risk Member | Minimum [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 20,000,000 | 13,000,000 | 17,000,000
Interest Rate Risk Member | Var At The End Of The Period [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 32,000,000 | 24,000,000 | 19,000,000
Currency Risk Member | Weighted average [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 12,000,000 | 6,000,000 | 6,000,000
Currency Risk Member | Maximum Member |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 20,000,000 | 6,000,000 | 7,000,000
Currency Risk Member | Minimum [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 3,000,000 | 5,000,000 | 6,000,000
Currency Risk Member | Var At The End Of The Period [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 12,000,000 | 5,000,000 | 5,000,000
Stock Market Risk [Member] | Weighted average [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 4,000,000 | 4,000,000 | 4,000,000
Stock Market Risk [Member] | Maximum Member |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 10,000,000 | 3,000,000 | 6,000,000
Stock Market Risk [Member] | Minimum [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 1,000,000 | 5,000,000 | 4,000,000
Stock Market Risk [Member] | Var At The End Of The Period [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 2,000,000 | 5,000,000 | 3,000,000
Vega Correlation Risk [Member] | Weighted average [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 11,000,000 | 9,000,000 | 9,000,000
Vega Correlation Risk [Member] | Maximum Member |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 20,000,000 | 9,000,000 | 11,000,000
Vega Correlation Risk [Member] | Minimum [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 6,000,000 | 9,000,000 | 7,000,000
Vega Correlation Risk [Member] | Var At The End Of The Period [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 11,000,000 | 8,000,000 | 7,000,000
Diversification Effect Member | Weighted average [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk | [1] | (28,000,000) | (20,000,000) | (20,000,000)
Diversification Effect Member | Maximum Member |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk | [1] | (14,000,000) | (21,000,000) | (21,000,000)
Diversification Effect Member | Minimum [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk | [1] | (39,000,000) | (18,000,000) | (18,000,000)
Diversification Effect Member | Var At The End Of The Period [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk | [1] | (29,000,000) | (22,000,000) | (17,000,000)
Total Member | Weighted average [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 27,000,000 | 19,000,000 | 21,000,000
Total Member | Maximum Member |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 39,000,000 | 25,000,000 | 26,000,000
Total Member | Minimum [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | 18,000,000 | 14,000,000 | 16,000,000
Total Member | Var At The End Of The Period [Member] |  |  |  |
Breakdown Of Var Line Items |  |  |  |
Value At Risk |  | € 28,000,000 | € 20,000,000 | € 17,000,000
[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 2020-01-01 -Paragraph 41 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_41&doctype=Standard -URIDate 2020-01-01 + Details
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