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Income Taxes - Summary of Current and Deferred Income Tax Relative to Items of Other Comprehensive Income Loss (Detail) - MXN ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income tax relating to components of other comprehensive income [abstract]
Tax effects relative to foreign exchange fluctuations from debt (note 20.2)	$ 0	$ (410)	$ (272)
Tax effects relative to foreign exchange fluctuations from intercompany balances (note 20.2)	32	(12)	(181)
Tax effects relative to actuarial (gains) and losses (note 20.2)	(1)	788	183
Foreign currency translation and other effects	201	(274)	906
Total current and deferred income tax relative to items of other comprehensive income (loss)	$ 232	$ 92	$ 636

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- Definition

Income tax relating to foreign exchange fluctuations from intercompany balances.

+ References

No definition available.

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X

- Definition

Income tax relating to tax effects relative to actuarial gains lose.

+ References

No definition available.

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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to change in value of foreign currency basis spreads. [Refer: Reserve of change in value of foreign currency basis spreads; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IAS
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-IssueDate 2017-01-01
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-URIDate 2017-03-09

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-Note Effective 2018-01-01
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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to hedges of net investments in foreign operations. [Refer: Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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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. [Refer: Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax]

+ References

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