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Inventories - Summary of Inventories (Detail)
$ in Millions, $ in Millions
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
[1]
Dec. 31, 2016
MXN ($)
Classes of current inventories [abstract]      
Finished products $ 25,374   $ 22,709
Raw materials 5,194   5,156
Spare parts 2,102   2,401
Work in process 198   144
Inventories in transit 1,437   1,188
Other 535   334
Inventories $ 34,840 $ 1,774 $ 31,932
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3