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Inventories, Net - Summary of Analysis of Inventories (Detail)
$ in Thousands, $ in Millions
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
MXN ($)
Classes of current inventories [abstract]      
Mobile phones, accessories, computers, TVs, cards and other materials $ 43,723,492   $ 42,262,511
Less: Reserve for obsolete and slow-moving inventories (3,418,130)   (3,452,946)
Total $ 40,305,362 $ 2,048 $ 38,809,565