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Inventories, Net - Summary of Analysis of Inventories (Detail)
$ in Thousands, $ in Millions
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Classes of current inventories [abstract]      
Mobile phones, accessories, computers, TVs, cards and other materials $ 42,262,511   $ 41,020,172
Less: Reserve for obsolete and slow-moving inventories (3,452,946)   (4,148,880)
Total $ 38,809,565 $ 1,961 $ 36,871,292