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Employee Benefits - Summary of Balances of the Liabilities for Employee Benefits (Detail) $ in Millions, $ in Millions | Dec. 31, 2019 MXN ($) | Dec. 31, 2019 USD ($) | [2] | Dec. 31, 2018 MXN ($)
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Disclosure of defined benefit plans [line items] |  |  |  |
Total Employee Benefits | $ 6,347 | [1] | $ 337 | $ 4,699
Pension and retirement plans [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation | 7,193 |  |  | 6,189
Defined benefit obligation funds at fair value | (2,678) |  |  | (2,501)
Net defined benefit liability | 4,515 |  |  | 3,688
Seniority premiums [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation | 1,237 |  |  | 772
Defined benefit obligation funds at fair value | (127) |  |  | (111)
Net defined benefit liability | 1,110 |  |  | 661
Post retirement medical services [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Defined benefit obligation | 797 |  |  | 418
Defined benefit obligation funds at fair value | (75) |  |  | (68)
Net defined benefit liability | $ 722 |  |  | $ 350
[1] | The Company initially adopted IFRS 16 at January 1st, 2019 using the modified retrospectively approach under which the comparative information is not restated. – See Note 2.4.1
[2] | Convenience translation to U.S. dollars ($) – See Note 2.2.3

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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 2019-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_57_a&doctype=Standard -URIDate 2019-03-27 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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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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- Definition The amount of non-current provisions for employee benefits. [Refer: Provisions for employee benefits] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_d&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_57_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Details
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- Details
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- Details
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