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Financial Instruments - Summary of Sensitivity Analysis of Interest Rate Risks Management (Detail) - Interest rate risk [member] $ in Millions | 12 Months Ended
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Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($)
Interest rate swap [member] | FEMSA [member] |  |  |
Disclosure of Interest Rate Risk Exposure [line items] |  |  |
Change in Bps. | 100 | 100 | 100
Effect on Equity | $ (432) | $ (359) | $ (452)
Interest rate swap [member] | Coca-Cola FEMSA [member] |  |  |
Disclosure of Interest Rate Risk Exposure [line items] |  |  |
Change in Bps. | 100 | 100 | 100
Effect on Equity | $ (37) | $ (1,976) | $ (234)
Unhedged Portion Bank Loans [member] |  |  |
Disclosure of Interest Rate Risk Exposure [line items] |  |  |
Change in interest rate | 100 | 100 | 100
Effect on profit loss | $ (50) | $ 145 | $ (251)

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- Details
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- Details
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- Details
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- Details
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