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v3.21.1

Bonus Programs - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($)
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Annual bonus percentage | 50.00% |  |
Bonus expense | $ 747 | $ 940 | $ 659
Vesting percentage | 33.00% |  |
Number of options granted | 0 | 0 | 0
Vesting period | 3 years |  |
The total expense recognized for the period arising from share-based payment transactions | $ 190 | $ 188 | $ 157
Share based payments | $ 192 | $ 234 |
FEMSA |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Annual bonus percentage | 50.00% |  |
Number of options granted | 2,083,809,000,000 |  |

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