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Bonus Programs - Summary of Shares Granted Under the Company's Executive Incentive Plans (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 0 | 0 | 0
2014 incentive plan [member] | Bottom of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 2015 |  |
2014 incentive plan [member] | Top of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 2017 |  |
2015 incentive plan [member] | Bottom of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 2016 |  |
2015 incentive plan [member] | Top of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 2018 |  |
2016 incentive plan [member] | Bottom of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 2017 |  |
2016 incentive plan [member] | Top of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 2019 |  |
2017 incentive plan [member] | Bottom of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 2018 |  |
2017 incentive plan [member] | Top of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 2020 |  |
Two Thousand Eighteen Incentive Plan [member] | Bottom of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 2019 |  |
Two Thousand Eighteen Incentive Plan [member] | Top of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 2021 |  |
FEMSA [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 2,052,792 |  |
FEMSA [member] | 2014 incentive plan [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 489,345 |  |
FEMSA [member] | 2015 incentive plan [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 457,925 |  |
FEMSA [member] | 2016 incentive plan [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 567,671 |  |
FEMSA [member] | 2017 incentive plan [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 326,561 |  |
FEMSA [member] | Two Thousand Eighteen Incentive Plan [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 211,290 |  |
KOF [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 2,091,744 |  |
KOF [member] | 2014 incentive plan [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 331,165 |  |
KOF [member] | 2015 incentive plan [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 415,375 |  |
KOF [member] | 2016 incentive plan [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 719,132 |  |
KOF [member] | 2017 incentive plan [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 369,791 |  |
KOF [member] | Two Thousand Eighteen Incentive Plan [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 256,281 |  |

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- Definition The number of share options granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_ii&doctype=Standard -URIDate 2018-03-16 + Details
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