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Inventories - Additional Information (Detail) $ in Millions, $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2019 MXN ($) | Jun. 30, 2018 MXN ($) | Jun. 30, 2019 USD ($) | [1],[2] | Dec. 31, 2018 MXN ($)
Classes of current inventories [abstract] |  |  |  |  |
Inventories | $ 37,438 | [1] |  | $ 1,949 | $ 35,686
Inventory write-downs | $ 1,198 |  | $ 2,172 |  |
[1] | The Company initially adopted IFRS 16 at January 1st, 2019 using the modified retrospective method under which the comparative information is not restated. - See Note 2.4.1
[2] | Convenience translation to U.S. dollars ($) - See Note 2.2.3

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