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Note 18 - Intangible assets - Sensitivity analysis (Details) € in Millions | Dec. 31, 2017 EUR (€)
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United States [Member] | Impact Of An Increase 50 Percent Basis Point [Member] | Discount Rate [Member] |  |
Sensitivity analysis for main hypotheses US |  |
Discount Rates Applied To Cash Flow Projections US Percentage | € (1,159) | [1]
United States [Member] | Impact Of An Increase 50 Percent Basis Point [Member] | Sustainable Growth Rate Member [Member] |  |
Sensitivity analysis for main hypotheses US |  |
Discount Rates Applied To Cash Flow Projections US Percentage | 661 | [1]
United States [Member] | Impact Of A Decrease 50 Percent Basis Point [Member] | Discount Rate [Member] |  |
Sensitivity analysis for main hypotheses US |  |
Discount Rates Applied To Cash Flow Projections US Percentage | 1,371 | [1]
United States [Member] | Impact Of A Decrease 50 Percent Basis Point [Member] | Sustainable Growth Rate Member [Member] |  |
Sensitivity analysis for main hypotheses US |  |
Discount Rates Applied To Cash Flow Projections US Percentage | (559) | [1]
Turkey [Member] | Impact Of An Increase 50 Percent Basis Point [Member] | Discount Rate [Member] |  |
Sensitivity analysis for main hypotheses US |  |
Discount Rates Applied To Cash Flow Projections US Percentage | (298) |
Turkey [Member] | Impact Of An Increase 50 Percent Basis Point [Member] | Sustainable Growth Rate Member [Member] |  |
Sensitivity analysis for main hypotheses US |  |
Discount Rates Applied To Cash Flow Projections US Percentage | 214 |
Turkey [Member] | Impact Of A Decrease 50 Percent Basis Point [Member] | Discount Rate [Member] |  |
Sensitivity analysis for main hypotheses US |  |
Discount Rates Applied To Cash Flow Projections US Percentage | 327 |
Turkey [Member] | Impact Of A Decrease 50 Percent Basis Point [Member] | Sustainable Growth Rate Member [Member] |  |
Sensitivity analysis for main hypotheses US |  |
Discount Rates Applied To Cash Flow Projections US Percentage | € (196) |
[1] | (*) Based on historical changes, the use of 50 basis points to calculate the sensitivity analysis would be a reasonable variation with respect to th e observed variations over the last five years.

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