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Inventories - Summary of Inventories (Detail)
$ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Dec. 31, 2017
USD ($)
Classes of current inventories [abstract]        
Finished products $ 3,691 $ 3,209    
Raw materials 4,092 3,974    
Non strategic spare parts 1,838 2,113    
Inventories in transit 1,208 1,207    
Packing materials 490 171    
Other 45 70    
Total 11,364 10,744   $ 579
Changes in inventories of finished goods and work in progress 21,412 18,154 $ 20,053  
Raw materials and consumables used 80,318 62,534 51,904  
Total $ 101,730 $ 80,688 $ 71,957