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Earnings per Shares - Summary of Capital Stock Prior To and Immediately After Stock Split (Detail)	9 Months Ended
	Sep. 30, 2019 shares
Fomento Economico Mexicano S.A.B. de C.V. [member]
Disclosure of Capital Stock [line items]
Percentage of the capital stock	47.20%
Percentage of ordinary shares with full voting rights	56.00%
The Coca-Cola Company [member]
Disclosure of Capital Stock [line items]
Percentage of the capital stock	27.80%
Percentage of ordinary shares with full voting rights	32.90%
Major ordinary share transactions prior to stock split [member]
Disclosure of Capital Stock [line items]
Outstanding shares	2,100,832,262
Percentage of the capital stock	100.00%
Percentage of ordinary shares with full voting rights	100.00%
Major ordinary share transactions prior to stock split [member] | Series L share [member]
Disclosure of Capital Stock [line items]
Shareholders	Public float
Outstanding shares	525,208,065
Percentage of the capital stock	25.00%
Percentage of ordinary shares with full voting rights	0.00%
Major ordinary share transactions prior to stock split [member] | Fomento Economico Mexicano S.A.B. de C.V. [member] | Series A shares [member]
Disclosure of Capital Stock [line items]
Shareholders	Wholly-owned subsidiary of Fomento Económico Mexicano, S.A.B. de C.V.
Outstanding shares	992,078,519
Percentage of the capital stock	47.223%
Percentage of ordinary shares with full voting rights	62.964%
Major ordinary share transactions prior to stock split [member] | The Coca-Cola Company [member] | Series D share [member]
Disclosure of Capital Stock [line items]
Shareholders	Wholly-owned subsidiaries of The Coca-Cola Company
Outstanding shares	583,545,678
Percentage of the capital stock	27.777%
Percentage of ordinary shares with full voting rights	37.036%
Major ordinary share transactions after stock split [member]
Disclosure of Capital Stock [line items]
Outstanding shares	16,806,658,096
Percentage of the capital stock	100.00%
Percentage of ordinary shares with full voting rights	100.00%
Major ordinary share transactions after stock split [member] | Series L share [member]
Disclosure of Capital Stock [line items]
Shareholders	Public float
Outstanding shares	2,626,040,325
Percentage of the capital stock	15.625%
Percentage of ordinary shares with full voting rights	0.00%
Major ordinary share transactions after stock split [member] | Series B Shares [member]
Disclosure of Capital Stock [line items]
Shareholders	Public float
Outstanding shares	1,575,624,195
Percentage of the capital stock	9.375%
Percentage of ordinary shares with full voting rights	11.11%
Major ordinary share transactions after stock split [member] | Fomento Economico Mexicano S.A.B. de C.V. [member] | Series A shares [member]
Disclosure of Capital Stock [line items]
Shareholders	Wholly-owned subsidiary of Fomento Económico Mexicano, S.A.B. de C.V.
Outstanding shares	7,936,628,152
Percentage of the capital stock	47.223%
Percentage of ordinary shares with full voting rights	55.968%
Major ordinary share transactions after stock split [member] | The Coca-Cola Company [member] | Series D share [member]
Disclosure of Capital Stock [line items]
Shareholders	Wholly-owned subsidiaries of The Coca-Cola Company
Outstanding shares	4,668,365,424
Percentage of the capital stock	27.777%
Percentage of ordinary shares with full voting rights	32.921%

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