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Inventories - Summary of Inventories (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2020
USD ($)
 [2]
Dec. 31, 2020
MXN ($)
Classes of current inventories [abstract]          
Finished products   $ 3,996     $ 3,694
Raw materials   3,657     3,224
Non strategic spare parts   1,006     934
Inventories in transit   1,340     1,284
Packing materials   240     271
Other   299     320
Total   10,538 [1]   $ 489 $ 9,727
Changes in inventories of finished goods and work in progress $ 23,901 24,676 $ 21,457    
Raw materials and consumables used 76,002 79,520 75,078    
Total $ 99,903 $ 104,196 $ 96,535    
[1] The Company initially adopted IFRS 16 on January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 3.18
[2] Convenience translation to U.S. dollars ($) – See Note 2.2.3