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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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