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Inventories, Net - Summary of Consolidated Balance of Inventories (Detail) - MXN ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Classes of current inventories [abstract]    
Finished goods $ 6,777 $ 5,933
Work-in-process 3,818 3,814
Raw materials 3,813 3,237
Materials and spare parts 5,964 4,996
Inventory in transit 876 872
Current inventories $ 21,248 $ 18,852