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Income Taxes - Summary of Income Tax Recognized in Consolidated Statement of Other Comprehensive Income (OCI) (Detail) - MXN ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income tax related to items charged or recognized directly in OCI during the year:
Unrealized loss (gain) on cash flow hedges	$ 216	$ (373)	$ (208)
Remeasurements of the net defined benefit liability	(130)	(192)	152
Total income tax recognized in OCI	86	(565)	(56)
Income tax related to items charged or recognized directly in OCI as of year-end:
Unrealized loss (gain) on derivative financial instruments	(212)	(481)	(128)
Comprehensive income to be reclassified to profit or loss in subsequent periods	(212)	(481)	(128)
Re-measurements of the net defined benefit liability	(378)	(240)	(56)
Balance of income tax in AOCI	$ (590)	$ (721)	$ (184)

X

- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to cash flow hedges. [Refer: Cash flow hedges [member]; Other comprehensive income]

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

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The amount of income tax relating to amounts recognised in other comprehensive income that will be reclassified to profit or loss. [Refer: Income tax relating to components of other comprehensive income]

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The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [member]]

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Balance of income tax included in accumulated other comprehensive income [abstract]

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Income tax remaining in other comprehensive income

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