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Post-Employment and Other Non-current Employee Benefits - Additional Information (Detail) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure of defined benefit plans [line items] |  |
Employee profit sharing | $ 1,068 | $ 673
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 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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- 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 2021-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_145_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Percentage of significant actuarial assumptions + References No definition available. + Details
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- Details
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- Details
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