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Financial Instruments - Summary of Outstanding Collar Options to Purchase Foreign Currency (Detail) - Options to purchase foreign currency [Member] - MXN ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
0-1 years [member]
Disclosure of Financial Assets and Financial Liabilities [Line Items]
Notional Amount	$ 813	$ 1,734
Fair value Liability	(19)	(33)
Fair Value Asset	4	$ 57
1-2 years [member]
Disclosure of Financial Assets and Financial Liabilities [Line Items]
Notional Amount	907
Fair value Liability	(20)
Fair Value Asset	$ 8

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Disclosure of financial assets and financial liabilities.

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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
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-IssueDate 2018-01-01
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- Definition

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

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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 2018-01-01
-Paragraph 112
-Subparagraph c
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