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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | $ (140,696,974) | $ (108,118,868) | $ (107,944,581) | $ (98,020,192)
Reportable segments [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 140,483,909 | 107,906,727 |  |
Reportable segments [member] | Mexico [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 115,691,830 | 84,592,642 |  |
Reportable segments [member] | Puerto Rico [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 13,228,592 | 13,986,596 |  |
Reportable segments [member] | Brazil [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 7,024,944 | 4,850,447 |  |
Reportable segments [member] | Europe [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 4,538,543 | 4,477,042 |  |
Defined benefit obligation [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | (342,569,774) | (306,702,447) | (329,113,625) | (313,282,595)
Defined benefit obligation [member] | Reportable segments [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 342,356,709 | 306,490,306 |  |
Defined benefit obligation [member] | Reportable segments [member] | Mexico [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 280,602,176 | 247,997,060 |  |
Defined benefit obligation [member] | Reportable segments [member] | Puerto Rico [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 35,803,893 | 35,220,889 |  |
Defined benefit obligation [member] | Reportable segments [member] | Brazil [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 21,412,097 | 18,795,315 |  |
Defined benefit obligation [member] | Reportable segments [member] | Europe [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 4,538,543 | 4,477,042 |  |
Plan assets [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 206,300,821 | 203,671,122 | 227,688,604 | 222,345,621
Plan assets [member] | Reportable segments [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | (206,300,821) | (203,671,122) |  |
Plan assets [member] | Reportable segments [member] | Mexico [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | (164,910,346) | (163,404,418) |  |
Plan assets [member] | Reportable segments [member] | Puerto Rico [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | (22,575,301) | (21,234,293) |  |
Plan assets [member] | Reportable segments [member] | Brazil [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | (18,815,174) | (19,032,411) |  |
Effect of asset celling [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | (4,428,021) | (5,087,543) | $ (6,519,560) | $ (7,083,218)
Effect of asset celling [member] | Reportable segments [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | 4,428,021 | 5,087,543 |  |
Effect of asset celling [member] | Reportable segments [member] | Brazil [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation and plan assets | $ 4,428,021 | $ 5,087,543 |  |

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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 2019-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_140_a&doctype=Standard -URIDate 2019-03-27 + Details
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