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Property, plant and equipment (Schedule of Net Book Value of Property, Plant and Equipment) (Details) - MXN ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]      
Net Book Value $ 15,950,352 $ 16,737,595 $ 16,971,000
Land [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net Book Value 1,316,000 1,291,000 1,217,000
Buildings [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net Book Value 4,227,000 4,056,000 3,625,000
Machinery and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net Book Value 9,255,000 9,879,000 7,187,000
Transportation equipment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net Book Value 75,000 76,000 78,000
Furniture, mixtures and computer equipment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net Book Value 63,000 64,000 64,000
Constructions and machinery in-progress [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net Book Value $ 1,015,000 $ 1,371,000 $ 4,800,000