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Income Taxes - Summary of Major Components of Income Tax Expense (Detail)
$ in Millions, $ in Millions
 12 Months Ended
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