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Financial Instruments - Summarizes Company's Financial Assets and Liabilities Measured at Fair Value (Detail) - MXN ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]
Derivative financial instruments asset		$ 2,605
Level 1 [member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial instruments asset	$ 21
Derivative financial instruments liability	205	236
Level 2 [member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial instruments asset	2,176
Derivative financial instruments liability	$ 1,244	$ 881

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

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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