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Financial information by segments (Schedule of Information About Geographical Areas) (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of geographical areas [line items]
Revenue	$ 35,869,314	$ 34,171,201	$ 35,678,253
Mexico [Member]
Disclosure of geographical areas [line items]
Revenue	19,660,889	18,530,672	20,507,794
USA [Member]
Disclosure of geographical areas [line items]
Revenue	5,549,781	7,120,360	9,246,444
Brazil [Member]
Disclosure of geographical areas [line items]
Revenue	10,659,259	8,520,169	5,924,015
Canada [Member]
Disclosure of geographical areas [line items]
Revenue	311,761	175,686	267,606
Latin America [Member]
Disclosure of geographical areas [line items]
Revenue	253,096	60,672	60,578
Other (Europe and Asia) [Member]
Disclosure of geographical areas [line items]
Revenue	$ 17,836	$ 16,540	$ 20,658

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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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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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