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Income Taxes - Summary of Net Deferred Income Tax Liability (Detail) - MXN ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Major components of tax expense (income) [abstract]
Balance at beginning of the period	$ (6,661)	$ (5,582)	$ (6,298)
Deferred tax provision for the period	(1,939)	(363)	497
Change in the statutory rate	(42)	(66)	63
Acquisition of subsidiaries	0	57	(413)
Effects in equity:
Unrealized loss (gain) on derivative financial instruments	216	(373)	(21)
Cumulative translation adjustment	(392)	(230)	31
Remeasurements of the net defined benefit liability	(130)	(192)	152
Inflation adjustment	279	88	20
Philippines disposal	0	0	387
Balance at end of the period	$ (8,669)	$ (6,661)	$ (5,582)

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- Definition

The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The gains (losses) representing the difference resulting from the restatement of non-monetary assets, owners' equity and items in the statement of comprehensive income and the adjustment of index linked assets and liabilities in hyperinflationary reporting.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The increase (decrease) in equity resulting from the disposal of subsidiaries. [Refer: Subsidiaries [member]]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to changes in the tax rate. [Refer: Accounting profit]

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Deferred tax assets relating to provisions

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Deferred tax liability unrealized exchange gains

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Income tax relating unrealized gain (loss) on derivative financial instruments

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Remeasurements of the net defined employee benefit liability

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