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Non-Controlling Interest in Consolidated Subsidiaries - Summary of Analysis of FEMSAs Non-Controlling Interest in its Consolidated Subsidiaries (Detail)
$ in Millions, $ in Millions
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
 [1]
Dec. 31, 2016
MXN ($)
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [Line Items]      
Non controlling interest $ 86,621 $ 4,411 $ 74,266
Coca-Cola FEMSA [member]      
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [Line Items]      
Non controlling interest 82,366   70,293
Other [Member]      
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [Line Items]      
Non controlling interest $ 4,255   $ 3,973
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3