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Trade Accounts Receivable, Net - Disclosure of Changes in Allowance for Expected Credit Losses (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial assets [line items]      
Balance at the beginning of the period $ 1,375    
Balance at the end of the period 2,114 $ 1,375  
Trade receivables [member]      
Disclosure of financial assets [line items]      
Balance at the beginning of the period 1,375 1,193 $ 849
Effect of adoption of IFRS 9 468    
Adjusted balance at the beginning of the period 1,843 1,193 849
Allowance for the period 348 530 467
Additions (write-offs) of uncollectible accounts [1] (402) (400) (418)
Addition from business combinations 1 86 94
Effects of changes in foreign exchange rates 324 (32) 201
Effect of Venezuela deconsolidation   (2)  
Balance at the end of the period $ 2,114 $ 1,375 $ 1,193
[1] In 2018, includes the effect of Coca-Cola FEMSA Philippines, Inc. sale for an aggregate amount of $ 82.