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Bonus Programs - Summary of Number of Shares Held by the Trust (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($)
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Fair value of shares held by trust | $ 638 | $ 488
FEMSA UBD [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of other equity instruments outstanding in share-based payment arrangement at beginning of period | 2,249,665 | 2,278,460
Shares acquired by the administrative trust to employees | 2,445,983 | 1,441,838
Shares released from administrative trust to employees upon vesting | 1,280,748 | 1,470,633
Number of other equity instruments outstanding in share-based payment arrangement at end of period | 3,414,900 | 2,249,665
KOFL UBL [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of other equity instruments outstanding in share-based payment arrangement at beginning of period | 752,847 | 697,226
Shares acquired by the administrative trust to employees | 985,535 | 456,077
Shares released from administrative trust to employees upon vesting | 378,224 | 400,456
Number of other equity instruments outstanding in share-based payment arrangement at end of period | 1,360,158 | 752,847

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