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Post-Employment and Other Non-current Employee Benefits - Summary of Changes in Balance of Trust Assets (Detail) - Trust assets [member] - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Pension and retirement plans [member] |  |  |
Disclosure Of Trust Assets [line items] |  |  |
Balance at beginning of year | $ 1,692 | $ 910 | $ 864
Actual return on trust assets | 30 | 113 | 15
Foreign exchange gain | (2) | 86 | 4
Life annuities | 16 | 21 | 28
Benefits paid | (1) | (136) | (1)
Acquisitions |  | 698 |
Philippines diposal | (704) |  |
Balance at end of year | 1,031 | 1,692 | 910
Seniority premium plan [member] |  |  |
Disclosure Of Trust Assets [line items] |  |  |
Balance at beginning of year | 109 | 102 | 101
Actual return on trust assets | 2 | 7 | 1
Balance at end of year | $ 111 | $ 109 | $ 102

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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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Balance Type: | debit
Period Type: | duration

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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 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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Period Type: | duration

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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Interest expense (income), 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 -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_c_i&doctype=Standard -URIDate 2018-03-16 + Details
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Period Type: | duration

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- Definition Acquisitions net defined benefit liability asset. + References No definition available. + Details
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- Definition Disclosure Of Trust Assets [line items] + 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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Data Type: | xbrli:monetaryItemType
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- Definition Life annuities, net defined benefit liability (asset). + References No definition available. + Details
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- Details
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- Details
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- Details
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Balance Type: |
Period Type: |