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Employee Benefits - Analysis of Net Liability and Net Period Cost for Employee Benefit (Detail) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | $ 143,516,143 | $ 137,923,317 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 16,971,936 | 15,979,152 | $ 18,688,374
Mexico [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 119,265,063 | 112,031,055 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 14,601,940 | 13,673,155 | 15,507,652
Puerto Rico [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 7,227,422 | 8,859,265 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 170,389 | 538,681 | 548,550
Brazil [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 7,401,235 | 6,303,584 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 369,624 | 587,552 | 724,587
Europe [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 8,919,884 | 9,971,256 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 1,750,101 | 1,176,028 | 1,753,872
Ecuador [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 479,762 | 519,239 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 40,498 | (29,743) | 111,353
El Salvador [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 113,508 | 135,299 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 15,190 | 14,384 | 19,081
Nicaragua [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 53,974 | 62,327 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 10,937 | 11,502 | 18,561
Honduras [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 55,295 | 41,292 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | $ 13,257 | $ 7,593 | $ 4,718

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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_57_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost and losses (gains) arising from settlements. [Refer: Decrease (increase) in net defined benefit liability (asset) resulting from gains (losses) arising from settlements; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 141 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_d&doctype=Standard -URIDate 2023-03-23 + Details
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