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Stockholders' Equity - Summary of Breakdown of Common Stock and Additional Paid-in Capital (Detail) - MXN ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Mar. 30, 2017	Mar. 31, 2016	Mar. 26, 2015
Disclosure of classes of share capital [abstract]
Common stock	$ 4,171	$ 4,162
Additional paid-in capital	140,483	123,174	$ 9,459	$ 6,966	$ 7,613
Common stock and additional paid-in capital	$ 144,654	$ 127,336

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Common stock and additional paid in capital.

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The amount received or receivable from the issuance of the entity's shares in excess of nominal value and amounts received from other transactions involving the entity's stock or stockholders.

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The nominal value of capital issued.

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