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Basis of preparation and presentation of the financial statements (Schedule of Relevant Exchange Rates Used) (Details) | 12 Months Ended |
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Dec. 31, 2018 | Dec. 31, 2017 | Apr. 09, 2019
Disclosure of subsidiaries [line items] |  |  |  |
Current exchange rate as of (Mexican pesos per one U.S. dollar) |  | 19.66 | 19.74 |
Average exchange rate for the year ended December 31 (Mexican pesos per one U.S. dollar) | [1] | 19.23 | 18.94 |
Non-adjusting events after reporting period [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Current exchange rate as of (Mexican pesos per one U.S. dollar) |  |  |  | 18.97
[1] | Average exchange rate used to translate revenues, costs and expenses of the companies mentioned above.

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- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Details
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