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Mergers, Acquisitions and Disposals - Summary of Unaudited Pro Forma Financial Information (Detail) - MXN ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about business combination [line items]
Total revenues	$ 473,420	$ 462,112	$ 410,831
Income before income taxes and share of the profit of equity accounted investees	34,266	39,917	29,950
Net income	$ 33,521	$ 37,311	$ 28,110
Series B 1 [member]
Disclosure of detailed information about business combination [line items]
Basic net controlling interest income per share	$ 1.22	$ 2.12	$ 1.08
Series D [member]
Disclosure of detailed information about business combination [line items]
Basic net controlling interest income per share	$ 1.52	$ 2.65	$ 1.35

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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