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Post-Employment and Other Non-current Employee Benefits - Summary of Changes in Balance of Defined Benefit Obligation for Post-Employment and Other Non-Current Employee Benefits (Detail) - Present value of defined benefit obligation [member] - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Balance at beginning of year | $ 3,388 | $ 4,369 | $ 2,915
Current service cost | 170 | 195 | 241
Effect on curtailment | 2 | (5) |
Interest expense | 275 | 265 | 258
Actuarial gains or losses | 585 | (391) | 190
Foreign exchange loss | (69) | (86) | (69)
Benefits paid | (395) | (265) | (385)
Acquisitions | 0 | 417 | 1,209
Philippines disposal | 0 | (1,111) | 0
Past service cost | (44) | 0 | 10
Balance at end of year | 3,912 | 3,388 | 4,369
Seniority premium plan [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Balance at beginning of year | 411 | 461 | 416
Current service cost | 35 | 42 | 44
Effect on curtailment | 0 | 0 | 0
Interest expense | 37 | 34 | 29
Actuarial gains or losses | 155 | (84) | 12
Benefits paid | (84) | (42) | (40)
Past service cost | 76 | 0 | 0
Balance at end of year | $ 630 | $ 411 | $ 461

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- Definition The amount of benefits paid or payable for retirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2019-01-01 -Paragraph 35 -Subparagraph b -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=26&code=ifrs-tx-2019-en-r&anchor=para_35_b_v&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_a&doctype=Standard -URIDate 2019-03-27 + Details
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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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- 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 increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_e&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_d&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Acquisitions net defined benefit liability asset. + References No definition available. + Details
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- Definition Actuarial Gains Losses Arising From Experience Adjustments + References No definition available. + Details
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- Definition Disposal net defined benefit liability asset. + References No definition available. + Details
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- Definition Gains losses arising from curtailments net defined benefit liability asset. + References No definition available. + Details
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- Details
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