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Cash and Cash Equivalents - Additional Information (Detail)
$ in Millions, $ in Millions
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
 [1]
Dec. 31, 2016
MXN ($)
Dec. 31, 2016
USD ($)
 [1]
Dec. 31, 2015
MXN ($)
Jan. 01, 2015
MXN ($)
Cash and cash equivalents1 [Line Items]            
Cash and cash equivalents $ 96,944 $ 4,936 $ 43,637 $ 2,222 $ 29,396 $ 35,497
Venezuela [member]            
Cash and cash equivalents1 [Line Items]            
Cash and cash equivalents $ 170          
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3