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Financial Instruments - Disclosure of Outstanding Forward Agreements to Purchase Foreign Currency (Detail) - Forward agreements 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	$ 6,479	$ 5,808
Fair value Liability	(80)	(65)
Fair Value Asset	28	$ 133
1-2 years [member]
Disclosure of Financial Assets and Financial Liabilities [Line Items]
Notional Amount	1,209
Fair Value Asset	$ 1

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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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- 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
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-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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-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
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