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Financial Instruments - Outstanding Forward Agreements to Purchase Foreign Currency (Detail) - MXN ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]
Fair Value Asset	$ 955,000,000	$ 4,615,000,000
Forward agreements to purchase foreign currency [member]
Disclosure of detailed information about financial instruments [line items]
Maturity Date	2018	2017
Notional Amount	$ 6,882,000,000	$ 6,559,000,000
Fair Value (Liability)	(22,000,000)	(194,000,000)
Fair Value Asset	$ 190,000,000	$ 362,000,000
Options to purchase foreign currency [member]
Disclosure of detailed information about financial instruments [line items]
Maturity Date	2018
Notional Amount	$ 266,000,000
Fair Value (Liability)	(5,000,000)
Fair Value Asset	$ 17,000,000

X

- Definition

The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

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- Definition

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+ References

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- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2017-01-01
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- Definition

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+ References

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