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Income Taxes - Summary of Major Components of Income Tax Expense (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 MXN ($) | Dec. 31, 2017 USD ($) | [1] | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($)
Major components of tax expense (income) [abstract] |  |  |  |
Current tax expense | $ 18,801 |  | $ 13,548 | $ 9,879
Deferred tax expense: |  |  |  |
Origination and reversal of temporary differences | (7,385) |  | (3,947) | 826
(Recognition) application of tax losses, net | (823) |  | (1,693) | (2,789)
Change in the statutory rate | (10) |  | (20) | 16
Total deferred tax income | (8,218) |  | (5,660) | (1,947)
Total | $ 10,583 | $ 539 | $ 7,888 | $ 7,932
[1] | Convenience translation to U.S. dollars ($) - See Note 2.2.3

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