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Inventories - Additional Information (Detail)
$ in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2019
MXN ($)
Jun. 30, 2018
MXN ($)
Jun. 30, 2019
USD ($)
 [1],[2]
Dec. 31, 2018
MXN ($)
Classes of current inventories [abstract]        
Inventories $ 37,438 [1]   $ 1,949 $ 35,686
Inventory write-downs $ 1,198 $ 2,172    
[1] The Company initially adopted IFRS 16 at January 1st, 2019 using the modified retrospective method under which the comparative information is not restated. - See Note 2.4.1
[2] Convenience translation to U.S. dollars ($) - See Note 2.2.3