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Note 18 - Intangible assets - Goodwill - Breakdown by CGU and Changes of the year - Business Combinations (Details) | 12 Months Ended
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Dec. 31, 2017
Intangible Assets and Goodwill Abstract |
Description of nature and financial effect of business combinations during period | There were no significant business combinations.

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- Definition The description of the nature and financial effect of business combinations during the current reporting period. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2016-01-13 -Paragraph 59 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2016-03-30&anchor=para_59_a&doctype=Standard -URIDate 2016-03-31 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | ifrs-full_DisclosureOfIntangibleAssetsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration