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Income Taxes - Schedule of Recognized in Consolidated Statement of Other Comprehensive Income (Detail) - MXN ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Major components of tax expense (income) [abstract]
Unrealized loss on cash flow hedges	$ (293)	$ (191)	$ 745
Exchange differences on translation of foreign operations	(2,647)	387	4,478
Remeasurements of the net defined benefit liability	287	(154)	(49)
Share of the other comprehensive income of equity accounted investees	989	(1,465)	(1,385)
Total income tax cost recognized in OCI	$ (1,664)	$ (1,423)	$ 3,789

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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- Definition

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]

+ References

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- Definition

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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