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Company Business - Summary of Significant Investments in Subsidiaries (Parenthetical) (Detail) | 12 Months Ended
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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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