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Non-Controlling Interest in Consolidated Subsidiaries - Summary of Changes in FEMSA's Non-Controlling Interest (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
 [1]
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]        
Balance at beginning of the period $ 86,621      
Capitalization of issued shares to former owners of Vonpar in Coca-Cola FEMSA     $ 4,082  
Balance at end of the period 78,489 $ 3,997 86,621  
Non-controlling interest [member]        
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]        
Balance at beginning of the period 86,621   74,266 $ 60,332
Net income of non-controlling interest 9,089   (5,202) 6,035
Other comprehensive income (loss): (4,080)   7,240 9,463
Exchange differences on translation of foreign operation (4,016)   7,349 9,238
Remeasurements of the net defined benefits liability 155   30 (63)
Valuation of the effective portion of derivative financial instruments (219)   (139) 288
Capitalization of issued shares to former owners of Vonpar in Coca-Cola FEMSA     2,867  
Other acquisitions and remeasurements 413   (50) 1,710
(Derecognition) contribution from non-controlling interest (11,140)   11,072 892
Equity instruments       (485)
Dividends (3,713)   (3,622) (3,690)
Share based payment 31   50 9
Balance at end of the period 78,489   $ 86,621 $ 74,266
Non-controlling interest [member] | IAS 29 [member]        
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]        
Accounting standard adoption effects 1,418      
Non-controlling interest [member] | Impact of adopting IFRS 9 [member]        
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items]        
Accounting standard adoption effects $ (150)      
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3