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Inventories - Summary of Inventories (Detail) $ in Millions, $ in Millions | 12 Months Ended |
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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

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