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Cost of Sales, Selling Expenses and Administrative Expenses (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cost of Sales, Selling Expenses and Administrative Expenses      
Cost of sales $ 13,329,335 $ 11,903,806 $ 10,336,861
Selling expenses 1,270,529 1,183,230 951,572
Administrative expenses 4,441,084 4,244,038 3,652,356
Total depreciation, amortization and other amortization 19,040,948 17,331,074 14,940,789
Employee benefits      
Short-term employee benefits 16,124,608 15,438,218 17,245,568
Share-based compensation 1,489,884 1,410,492 1,199,489
Post-employment benefits 158,905 53,344 38,334
Employee benefits $ 17,773,397 $ 16,902,054 $ 18,483,391