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Financial Instruments - Disclosure of Fair Value of Commodity Price Contracts (Detail) - Coca-Cola FEMSA [member] - MXN ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Sugar Price Contracts [member] | 0-1 years [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Notional Amount | $ 971 | $ 1,223
Fair Value Asset | (33) | (88)
Sugar Price Contracts [member] | 1-2 years [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Notional Amount | 209 |
Fair Value Asset | 13 |
Aluminum price contracts [member] | 0-1 years [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Notional Amount | 398 | 265
Fair Value Asset | (24) | (17)
Aluminum price contracts [member] | 1-2 years [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Notional Amount | 39 |
Fair Value Asset | (1) |
PX MEG contracts [member] | 0-1 years [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Notional Amount | 651 | 1,303
Fair Value Asset |  | $ (131)
Fair value Liability | (110) |
PX MEG contracts [member] | 1-2 years [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Notional Amount | 165 |
Fair value Liability | $ (28) |

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