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Trade Accounts Receivable, Net - Changes in Allowance for Expected Credit Losses (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Trade receivables [member]      
Disclosure of financial assets [line items]      
Balance at the beginning of the period $ 2,189 $ 2,114 $ 1,375
Effect of adoption of IFRS 9     468
Adjusted balance at the beginning of the period 2,189 2,114 1,843
Allowance for the period 591 709 348
Additions (write-offs) of uncollectible accounts (613) (269) (402)
Addition from business combinations 273   1
Effects of changes in foreign exchange rates 22 (365) 324
Balance at the end of the period $ 2,462 2,189 $ 2,114
Coca Cola FEMSA Philippines      
Disclosure of financial assets [line items]      
Additions (write-offs) of uncollectible accounts   $ (82)