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Inventories, Net - Summary of Analysis of Inventories (Detail)
$ in Thousands, $ in Millions
Dec. 31, 2020
MXN ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
MXN ($)
Classes of current inventories [abstract]      
Mobile phones, accessories, computers, TVs, cards and other materials $ 33,763,086   $ 43,954,616
Less: Reserve for obsolete and slow-moving inventories (3,385,647)   (2,852,604)
Total $ 30,377,439 $ 1,523 $ 41,102,012