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Available-for-sale financial investments (Details 2) - shares | Dec. 31, 2017 | Dec. 31, 2016
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Financial Assets Available-for-Sale, Category [Member] | Equity Investments [Member] | Union Andina de Cementos S.A.A. [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Number of shares | 9,148,373 | [1] | 256,624 | [2]
[1] | Represents 7.76% of its common shares.
[2] | Represents 0.016% of its common shares.

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- Definition The number of shares issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
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