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Bonus Programs - Summary of Shares Granted Under the Company's Executive Incentive Plans (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 0 | 0 | 0
FEMSA |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 2,083,809,000,000 |  |
FEMSA | 2016 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 567,671,000,000 |  |
FEMSA | 2017 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 326,561,000,000 |  |
FEMSA | 2018 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 211,290,000,000 |  |
FEMSA | 2019 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 312,006,000,000 |  |
FEMSA | 2020 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 666,281,000,000 |  |
KOF |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 2,759,468,000,000 |  |
KOF | 2016 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 719,132,000,000 |  |
KOF | 2017 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 369,791,000,000 |  |
KOF | 2018 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 256,281,000,000 |  |
KOF | 2019 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 457,338,000,000 |  |
KOF | 2020 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares | 956,926,000,000 |  |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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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 2019-01-01 -Paragraph 45 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_ii&doctype=Standard -URIDate 2019-03-27 + Details
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