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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Major components of tax expense (income) [abstract] |  |  |
Balance at beginning of the period | $ 28,871 | $ 25,879 | $ 24,817
Increase | 4,985 | 6,029 | 3,398
Usage of tax losses | (1,986) | (1,854) | (352)
Unused tax losses - 2024 to 2026 | (7,830) | 0 | 0
Effect of foreign currency exchange rates | (2,518) | (1,183) | (1,984)
Balance at end of the period | $ 21,522 | $ 28,871 | $ 25,879

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