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Employee Benefits - Summary of Defined Benefit Obligation (DBO) and Plan Assets for Pension and Other Benefit Obligation Plans (Detail) - MXN ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | $ (134,420,606) | $ (128,400,391) | $ (131,410,989) | $ (154,847,297)
Reportable segments [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 134,188,504 | 128,125,182 |  |
Reportable segments [member] | Mexico [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 118,286,212 | 110,960,878 |  |
Reportable segments [member] | Puerto Rico [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 7,227,422 | 8,859,265 |  |
Reportable segments [member] | Brazil [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 5,290,237 | 4,840,262 |  |
Reportable segments [member] | Europe [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 3,384,633 | 3,464,777 |  |
Defined benefit obligation [member] | Reportable segments [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 334,226,051 | 330,587,732 |  |
Defined benefit obligation [member] | Reportable segments [member] | Mexico [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 293,551,400 | 285,775,547 |  |
Defined benefit obligation [member] | Reportable segments [member] | Puerto Rico [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 22,244,771 | 26,747,454 |  |
Defined benefit obligation [member] | Reportable segments [member] | Brazil [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 15,045,247 | 14,599,954 |  |
Defined benefit obligation [member] | Reportable segments [member] | Europe [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 3,384,633 | 3,464,777 |  |
Plan assets [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 204,092,587 | 208,526,619 | 218,327,182 | 191,549,583
Plan assets [member] | Reportable segments [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | (204,092,587) | (208,526,619) |  |
Plan assets [member] | Reportable segments [member] | Mexico [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | (175,265,188) | (174,814,669) |  |
Plan assets [member] | Reportable segments [member] | Puerto Rico [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | (15,017,349) | (17,888,189) |  |
Plan assets [member] | Reportable segments [member] | Brazil [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | (13,810,050) | (15,823,761) |  |
Effect of asset celling [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | (4,055,040) | (6,064,069) | $ (4,422,459) | $ (3,393,640)
Effect of asset celling [member] | Reportable segments [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 4,055,040 | 6,064,069 |  |
Effect of asset celling [member] | Reportable segments [member] | Brazil [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | $ 4,055,040 | $ 6,064,069 |  |

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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_140_a&doctype=Standard -URIDate 2023-03-23 + Details
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