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Employee Benefits - Analysis of Net Liability and Net Period Cost for Employee Benefit (Detail) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | $ 168,230,202 | $ 152,507,058 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 18,085,954 | 16,609,565 | $ 13,989,100
Mexico [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 129,260,355 | 116,537,660 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 14,911,208 | 12,788,464 | 12,046,208
Puerto Rico [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 14,924,874 | 13,228,592 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 664,046 | 747,755 | 686,067
Europe [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 14,392,445 | 12,827,318 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 1,701,424 | 2,526,957 | 619,039
Brazil [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 8,913,548 | 9,503,738 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 722,412 | 511,964 | 579,432
Ecuador [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 488,161 | 409,750 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 67,402 | $ 34,425 | $ 58,354
El Salvador [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 154,422 |  |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 15,751 |  |
Nicaragua [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 61,337 |  |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 3,711 |  |
Honduras [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | $ 35,060 |  |

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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 2020-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost and gains (losses) arising from settlements. [Refer: Gains (losses) arising from settlements, net defined benefit liability (asset); Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_d&doctype=Standard -URIDate 2020-01-01 + Details
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