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v3.21.1

Post-Employment and Other Non-current Employee Benefits - Additional Information (Detail) | 12 Months Ended
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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%

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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 + Details
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