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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, 2017 | Dec. 31, 2016
FEMSA UBD [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Beginning balance | 3,625,171 | 4,246,792
Shares acquired by the administrative trust to employees | 1,311,599 | 2,375,196
Shares released from administrative trust to employees upon vesting | (1,991,561) | (2,996,817)
Forfeitures | 0 | 0
Ending balance | 2,945,209 | 3,625,171
KOFL [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Beginning balance | 1,068,327 | 1,160,311
Shares acquired by the administrative trust to employees | 344,770 | 695,487
Shares released from administrative trust to employees upon vesting | (477,198) | (787,471)
Forfeitures | 0 | 0
Ending balance | 935,899 | 1,068,327

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- Definition The number of share options outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_d&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_i&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_vi&doctype=Standard -URIDate 2017-03-09 + Details
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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 2017-01-01 -Paragraph 45 -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_iv&doctype=Standard -URIDate 2017-03-09 + Details
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