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Financial Instruments - Disclosure of Fair Value of Commodity Price Contracts (Detail) - Coca-Cola FEMSA [member] - MXN ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Sugar Price Contracts [member] | Less than 1 year [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Notional amount | $ 1,223 | $ 992
Fair Value Asset | (88) | (7)
Sugar Price Contracts [member] | 1-2 years [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Notional amount |  | 150
Fair Value Asset |  | $ 3
Aluminum price contracts [member] | Less than 1 year [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Notional amount | 265 |
Fair Value Liability | (17) |
PX MEG contracts [member] | Less than 1 year [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Notional amount | 1,303 |
Fair Value Liability | $ (131) |

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- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 + Details
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