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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, 2018	Dec. 31, 2017	Mar. 30, 2017	Mar. 31, 2016
Disclosure of classes of share capital [abstract]
Common stock	$ 4,171	$ 4,171
Additional paid-in capital	141,151	140,483	$ 9,459	$ 6,966
Common stock and additional paid-in capital	$ 145,322	$ 144,654

X

- Definition

Common stock and additional paid in capital.

+ References

No definition available.

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- Definition

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.

+ References

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- Definition

The nominal value of capital issued.

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