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Financial Instruments - Summarizes Company's Financial Assets and Liabilities Measured at Fair Value (Detail) - MXN ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]
Derivative financial instruments asset	$ 2,524	$ 9
Level 1
Disclosure of detailed information about financial instruments [line items]
Derivative financial instruments asset	488	91
Derivative financial instruments liability	84	47
Trust assets of labor obligations	1,338	1,249
Level 2
Disclosure of detailed information about financial instruments [line items]
Derivative financial instruments asset	2,440	905
Derivative financial instruments liability	1,417	2,191
Trust assets of labor obligations	$ 0	$ 0

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.

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- Definition

Trust Assets Of Labor Obligations

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