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Taxes - Expense Recognized in OCI (Details) - MXN ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Major components of tax expense (income) [abstract]
Unrealized gain (loss) on cash flow hedges	$ 871	$ (391)	$ (293)
Exchange differences on translation of foreign operations	4,758	(1,667)	(2,647)
Remeasurements of the net defined benefit liability	(208)	(371)	287
Share of the other comprehensive income of equity accounted investees	(2,597)	288	989
Total income tax benefit recognized in OCI	$ 2,824	$ (2,141)	$ (1,664)

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]

+ References

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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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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to exchange differences on the translation of financial statements of foreign operations. [Refer: Other comprehensive income; Reserve of exchange differences on translation]

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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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- Definition

The amount of income tax relating to an entity's share of other comprehensive income of associates and joint ventures accounted for using the equity method that will be reclassified to profit or loss. [Refer: Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax]

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