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Trade Accounts Receivable, Net - Additional Information (Detail)
$ in Millions, $ in Millions
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
MXN ($)
Disclosure Of Trade Accounts Receivable [Line Items]              
Receivables         $ 30,478   $ 30,160
Other financial obligations         19,362   11,658
Securitization programs [member]              
Disclosure Of Trade Accounts Receivable [Line Items]              
Receivables       $ 647 12,713 $ 658 13,644
Other financial obligations       $ 576 $ 11,313 $ 535 $ 11,095
Financial expense $ 308 $ 258 $ 249