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Accounting Policies - Share-based Payment Agreements (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Payment Agreements      
Share-based compensation expense $ 1,489,884 $ 1,410,492 $ 1,199,489
Share-based compensation credited in consolidated stockholder's equity $ 1,468,337 $ 1,392,534 $ 1,184,524