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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [abstract] |  |  |
Balance at beginning of the period | $ 25,879 | $ 24,817 | $ 24,791
Increase | 6,029 | 3,398 | 3,334
Usage of tax losses | (1,854) | (352) | (2,723)
Effect of foreign currency exchange rates | (1,183) | (1,984) | (585)
Balance at end of the period | $ 28,871 | $ 25,879 | $ 24,817

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