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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
	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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Other comprehensive income net of tax change in exchange rates from intercompany balances.

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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]

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The amount of other comprehensive income, net of tax, related to exchange differences when financial statements of foreign operations are translated. [Refer: Other comprehensive income]

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The amount of other comprehensive income, net of tax, related to hedges of net investments in foreign operations. [Refer: Other comprehensive income]

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