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Balances and Transactions with Related Parties and Affiliated Companies - Commitments (Detail) - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of transactions between related parties [line items] |  |  |
Commitment | Supply |  |
Conditions | Supply of all beer products in Mexico's OXXO stores. The contract may be renewed for five years or additional periods. At the end of the contract OXXO will not hold exclusive contract with another supplier of beer for the next 3 years. Commitment term, January 1st, 2010 to June 30, 2020. |  |
Short-term employee benefits paid | $ 2,112 | $ 2,163 | $ 1,885
Postemployment benefits | 45 | 48 | 37
Termination benefits | 373 | 411 | 88
Share based payments | $ 575 | $ 610 | $ 401
Heineken Group |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Renewal option for supply contract | 5 years |  |
Restriction period from holding exclusive contract with another supplier at the end of the contract term | 3 years |  |

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- Definition Term of renewal option for related party transaction. + References No definition available. + Details
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- Definition The description of the nature of the related party relationships. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2020-01-01 -Paragraph 18 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_18&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The explanation of the terms and conditions of outstanding balances for related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2020-01-01 -Paragraph 18 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_18_b_i&doctype=Standard -URIDate 2020-01-01 + Details
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