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Post-Employment and Other Non-current Employee Benefits - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020
Actuarial Assumption of Discount Rates
Disclosure of defined benefit plans [line items]
Impact on absolute terms of variation in the assumptions on net defined benefit liability	1.00%
Percentage of significant actuarial assumptions	1.00%
Subsidiaries
Disclosure of defined benefit plans [line items]
Percentage of plan asset investment for related parties	30.00%
Mexican Federal Government Instruments
Disclosure of defined benefit plans [line items]
Percentage of fund assets	10.00%

X

- 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.

+ Details

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- Definition

The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 145
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_145_a&doctype=Standard
-URIDate 2019-03-27

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- Definition

Percentage of fund assets

+ References

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- Definition

Percentage of plan asset investment for related parties

+ References

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- Definition

Percentage of significant actuarial assumptions

+ References

No definition available.

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