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Bonus Programs - Summary of Number of Shares Held by the Trust (Detail) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
FEMSA UBD [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Beginning balance | 2,278,460 | 2,945,209
Shares acquired by the administrative trust to employees | 1,441,838 | 913,846
Shares released from administrative trust to employees upon vesting | 1,470,633 | 1,580,595
Ending balance | 2,249,665 | 2,278,460
KOFL UBL [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Beginning balance | 697,226 | 935,899
Shares acquired by the administrative trust to employees | 456,077 | 262,909
Shares released from administrative trust to employees upon vesting | 400,456 | 501,582
Ending balance | 752,847 | 697,226

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- Definition The number of share options exercised in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_iv&doctype=Standard -URIDate 2019-03-27 + Details
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