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Income Taxes - Schedule of Changes in Balance of Tax Loss Carryforwards (Detail) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Major components of tax expense (income) [abstract] |  |
Balance at beginning of the year | $ 27,452 | $ 16,463
Reserved |  | (2)
Additions | 5,673 | 6,349
Usage of tax losses | (3,157) | (168)
Translation effect of beginning balances | (481) | 4,810
Balance at end of the year | $ 29,487 | $ 27,452

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