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Financial Instruments - Net Effect of Expired Contracts That Did Not Meet Hedging Criteria (Details) - Derivative Contract Not Met Hedging Criteria - Market value gain on financial instruments - MXN ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cross-currency swaps
Disclosure of detailed information about hedges [line items]
Net effects of expired contracts	$ 212	$ 293
Embedded Derivative
Disclosure of detailed information about hedges [line items]
Net effects of expired contracts		$ (4)

X

- Definition

The gain (loss) attributable to expired derivative contracts recognized in profit or loss during the period.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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