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Inventories, Net - Summary of Consolidated Balance of Inventories (Detail) - MXN ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Classes of current inventories [abstract]    
Finished goods $ 5,933 $ 5,865
Work-in-process 3,814 3,378
Raw materials 3,237 3,128
Materials and spare parts 4,996 4,551
Inventory in transit 872 1,176
Current inventories $ 18,852 $ 18,098