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Income Taxes - Summary of Changes in Balance of Tax Loss Carryforwards (Detail) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [abstract] |  |  |
Balance at beginning of the period | $ 24,817 | $ 24,791 | $ 14,900
Increase (see sources above) | 3,398 | 3,334 | 5,616
Usage of tax losses | (352) | (2,723) | (4)
Effect of foreign currency exchange rates | (1,984) | (585) | 4,279
Balance at end of the period | $ 25,879 | $ 24,817 | $ 24,791

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