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Financial Instruments - Summary of Sensitivity Analysis of Interest Rate Risks (Detail) - Interest Rate Risk - MXN ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of nature and extent of risks arising from financial instruments [line items]
Change in U.S.$ rate	10000.00%	10000.00%	10000.00%
Effect on (profit) or loss	$ (102)	$ (44)	$ (134)

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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

Change in foreign currancy rate, effect on profit (loss).

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- Definition

Change in US dollar rate basis points description.

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