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Income Taxes - Summary of Major Components of Income Tax Expense (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
 [1]
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Major components of tax expense (income) [abstract]        
Current tax expense $ 10,480   $ 18,592 $ 13,548
Deferred tax expense:        
Origination and reversal of temporary differences 491   (7,546) (3,947)
(Recognition) of tax losses, net (927)   (823) (1,693)
Change in the statutory rate 125   (10) (20)
Total deferred tax income (311)   (8,379) (5,660)
Total $ 10,169 $ 518 $ 10,213 [2] $ 7,888
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3
[2] Revised to reflect the discontinued Philippines operations of Coca-Cola FEMSA - See Note 4.2.1