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Other Liabilities, Provisions, Contingencies and Commitments - Nature and Amount of Loss Contingencies (Detail) - MXN ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Disclosure of financial liabilities [line items] |  |  |  |
Provisions | $ 9,928 | $ 12,855 |  |
Indirect taxes [member] |  |  |  |
Disclosure of financial liabilities [line items] |  |  |  |
Provisions | 5,421 | 6,836 | $ 11,065 | $ 1,725
Labor [member] |  |  |  |
Disclosure of financial liabilities [line items] |  |  |  |
Provisions | 2,601 | 2,723 | 2,578 | 1,372
Legal [member] |  |  |  |
Disclosure of financial liabilities [line items] |  |  |  |
Provisions | $ 1,906 | $ 3,296 | $ 2,785 | $ 318

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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 2018-01-01 -Paragraph 54 -Subparagraph l -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_l&doctype=Standard -URIDate 2018-03-16 + Details
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