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v3.19.1

Employee Benefits - Summary of Changes in the Balance of the Defined Benefit Obligation for Post-employment (Detail) - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Initial balance | $ 7,370 |  |
Ending balance | 6,189 | $ 7,370 |
Pension and retirement plans [member] | Present value of defined benefit obligation [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Initial balance | 7,370 | 5,702 | $ 5,308
Current service cost | 318 | 341 | 245
Past service cost |  | 10 | 45
Interest expense | 484 | 491 | 369
Effect on curtailment |  | (2) | (61)
Curtailment / Settlement | (5) |  |
Remeasurements of the net defined benefit obligation | (740) | 263 | (67)
Foreign exchange loss (gain) | (86) | (79) | 150
Benefits paid | (450) | (550) | (287)
(Derecognition) acquisitions | (702) | 1,194 |
Ending balance | 6,189 | 7,370 | 5,702
Seniority premiums [member] | Present value of defined benefit obligation [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Initial balance | 783 | 663 | 610
Current service cost | 125 | 106 | 93
Interest expense | 57 | 49 | 41
Curtailment / Settlement | (8) | (1) |
Remeasurements of the net defined benefit obligation | (115) | 28 | (43)
Benefits paid | (77) | (68) | (55)
Acquisitions | 7 | 6 | 17
Ending balance | 772 | 783 | 663
Post retirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Initial balance | 524 |  |
Ending balance | 418 | 524 |
Post retirement medical services [member] | Present value of defined benefit obligation [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Initial balance | 524 | 460 | 404
Current service cost | 25 | 24 | 22
Interest expense | 39 | 34 | 27
Curtailment / Settlement | (1) |  |
Remeasurements of the net defined benefit obligation | (143) | 32 | 30
Benefits paid | (26) | (26) | (23)
Ending balance | 418 | 524 | 460
Post-employment [member] | Present value of defined benefit obligation [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Initial balance | 0 | 0 | 135
Reclassification to certain liability cost | 0 | 0 | (135)
Ending balance | $ 0 | $ 0 | $ 0

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- Definition Gains (losses) arising from acquisitions, 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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- Definition Reclasification to certain liability cost, net defined benefit liability (asset) + References No definition available. + Details
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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 2018-01-01 -Paragraph 35 -Subparagraph b -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=26&date=2018-03-01&anchor=para_35_b_v&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_a&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_57_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from settlements. Settlements are transactions that eliminate all further legal or constructive obligations for part or all of the benefits provided under a defined benefit plan, other than a payment of benefits to, or on behalf of, employees that is set out in the terms of the plan and included in the actuarial assumptions. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_d&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_e&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_b&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_d&doctype=Standard -URIDate 2018-03-16 + Details
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