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Income Taxes - Summary of the Balances of the Deferred tax Assets and Liabilities in Statement of Financial Position (Detail) - MXN ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of Deferred Tax Assets And Liabilities [line items] |  |
Asset | $ 11,567 | $ 14,817
Liability | (14,900) | (15,801)
Net | (3,333) | (984)
Country of domicile [member] |  |
Disclosure of Deferred Tax Assets And Liabilities [line items] |  |
Asset | 3,079 | 3,212
Liability | (7,493) | (7,190)
Net | (4,414) | (3,978)
Foreign countries [member] |  |
Disclosure of Deferred Tax Assets And Liabilities [line items] |  |
Asset | 8,488 | 11,605
Liability | (7,407) | (8,611)
Net | $ 1,081 | $ 2,994

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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of deferred tax assets net of deferred tax liabilities, when the absolute amount of deferred tax assets is greater than the absolute amount of deferred tax liabilities. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of deferred tax liabilities net of deferred tax assets, when the absolute amount of deferred tax liabilities is greater than the absolute amount of deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2018-03-16 + Details
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