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Financial information by segments (Schedule of Information About Geographical Areas) (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of geographical areas [line items]
Revenue	$ 34,171,201	$ 35,678,253	$ 28,700,450
Mexico [Member]
Disclosure of geographical areas [line items]
Revenue	18,530,672	20,507,794	17,125,369
USA [Member]
Disclosure of geographical areas [line items]
Revenue	7,120,360	9,246,444	8,370,999
Brazil [Member]
Disclosure of geographical areas [line items]
Revenue	8,520,169	5,924,015	3,204,082
Canada [Member]
Disclosure of geographical areas [line items]
Revenue	175,686	267,606	370,803
Latin America [Member]
Disclosure of geographical areas [line items]
Revenue	60,672	60,578	30,173
Other (Europe and Asia) [Member]
Disclosure of geographical areas [line items]
Revenue	$ 16,540	$ 20,658	$ 39,224

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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Expiry date 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants. Effective 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

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