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Income Taxes - Summary of Breakdown of Changes in Consolidated Deferred Income Taxes (Detail) - MXN ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Changes in deferred tax liability (asset) [abstract]
Deferred income tax (charged) credited to the income statement	$ 2,938	$ 331	$ (8,489)
Deferred income tax (charged) credited to stockholders' equity	200	514	1,089
Reclassification to other captions in the statement of financial position and in the income statement	(560)	531	(5,467)
Change in deferred income tax during the period	$ 2,578	$ 1,376	$ (12,867)

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- References

No definition available.

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- Definition

The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities]

+ References

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- Definition

The amount of deferred tax related to items credited (charged) directly to equity. [Refer: Deferred tax expense (income)]

+ References

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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income]

+ References

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- Definition

The increase (decrease) in a deferred tax liability (asset). [Refer: Deferred tax liability (asset)]

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