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Taxes - Schedule 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
Major components of tax expense (income) [abstract] |  |
Balance at beginning of the period | $ 29,941 | $ 29,487
Derecognized | (377) | (306)
Additions | 7,194 | 4,124
Usage of tax losses | (2,947) | (1,385)
Translation effect of beginning balances | (1,275) | (1,979)
Balance at end of the period | $ 32,536 | $ 29,941

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