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Other Liabilities, Provisions, Contingencies and Commitments - Contingencies (Detail) - MXN ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Disclosure of financial liabilities [line items] |  |  |  |
Provisions | $ 6,303 | $ 8,854 |  |
Indirect taxes [member] |  |  |  |
Disclosure of financial liabilities [line items] |  |  |  |
Provisions | 3,153 | 5,062 | $ 5,421 | $ 6,836
Labor [member] |  |  |  |
Disclosure of financial liabilities [line items] |  |  |  |
Provisions | 1,857 | 2,455 | 2,601 | 2,723
Legal [member] |  |  |  |
Disclosure of financial liabilities [line items] |  |  |  |
Provisions | $ 1,293 | $ 1,337 | $ 1,906 | $ 3,296

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- Definition The amount of liabilities of uncertain timing or amount. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph l -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_l&doctype=Standard -URIDate 2020-01-01 + Details
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