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Stockholders' Equity - Summary of Translation Effects of Foreign Subsidiaries Included in Statements of Comprehensive Income (Loss) (Detail) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Exchange differences on translation [abstract] |  |  |
Foreign currency translation result | $ (3,713) | $ (3,116) | $ 20,648
Foreign exchange fluctuations from debt | 2,438 | (4,160) | 1,367
Foreign exchange fluctuations from intercompany balances | (425) | (2,243) | (10,385)
Translation effects of foreign subsidiaries, net | $ (1,700) | $ (9,519) | $ 11,630

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- Definition The gains (losses) recognised in other comprehensive income on exchange differences on the translation of financial statements of foreign operations, before tax. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 91 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_91_b&doctype=Standard -URIDate 2018-03-16 + Details
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