Intangible Assets - Disclosure of Aggregate Carrying Amounts of Goodwill and Distribution Rights Allocated to Each CGU (Detail) $ in Millions, $ in Millions	Dec. 31, 2019 MXN ($)		Dec. 31, 2019 USD ($)	[2]	Dec. 31, 2018 MXN ($)	Dec. 31, 2017 MXN ($)
Disclosure of information for cash-generating units [line items]
Goodwill and distribution rights allocated	$ 146,562	[1]	$ 7,771		$ 145,610	$ 154,093
Cash Generating Units [member] | Coca-Cola FEMSA [member]
Disclosure of information for cash-generating units [line items]
Goodwill and distribution rights allocated	107,088				111,347
Mexico [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]
Disclosure of information for cash-generating units [line items]
Goodwill and distribution rights allocated	56,352				56,352
Guatemala [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]
Disclosure of information for cash-generating units [line items]
Goodwill and distribution rights allocated	1,679				1,853
Nicaragua [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]
Disclosure of information for cash-generating units [line items]
Goodwill and distribution rights allocated	420				460
Costa Rica [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]
Disclosure of information for cash-generating units [line items]
Goodwill and distribution rights allocated	1,442				1,417
Panama [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]
Disclosure of information for cash-generating units [line items]
Goodwill and distribution rights allocated	1,131				1,182
Colombia [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]
Disclosure of information for cash-generating units [line items]
Goodwill and distribution rights allocated	4,367				4,600
Brazil [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]
Disclosure of information for cash-generating units [line items]
Goodwill and distribution rights allocated	38,765				42,153
Argentina [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]
Disclosure of information for cash-generating units [line items]
Goodwill and distribution rights allocated	306				327
Uruguay [member] | Cash Generating Units [member] | Coca-Cola FEMSA [member]
Disclosure of information for cash-generating units [line items]
Goodwill and distribution rights allocated	$ 2,626				$ 3,003

[1] The Company initially adopted IFRS 16 at January 1st, 2019 using the modified retrospectively approach under which the comparative information is not restated. – See Note 2.4.1

[2] Convenience translation to U.S. dollars ($) – See Note 2.2.3