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Company Business - Summary of Significant Investments in Subsidiaries (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018
Disclosure Of Parent Entity Information [line items]
Country of incorporation	Mexico
Farmacias Yza [member]
Disclosure Of Parent Entity Information [line items]
Percent of ownership interest	18.60%
Grupo Socofar [member]
Disclosure Of Parent Entity Information [line items]
Percent of ownership interest	60.00%

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