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Financial Instruments - Summary of Outstanding Collar Options to Purchase Foreign Currency (Detail) - Less than 1 year [member] - Options to purchase foreign currency [Member] - MXN ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Financial Assets and Financial Liabilities [Line Items]
Notional amount	$ 1,734	$ 266
Fair value Liability	(33)	(5)
Fair Value Asset	$ 57	$ 17

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- Definition

Disclosure of financial assets and financial liabilities.

+ References

No definition available.

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- Definition

The fair value of financial assets. [Refer: At fair value [member]; Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 25
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-URIDate 2018-03-16

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- Definition

The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
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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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-Number 1
-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard
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