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Income Taxes - Summary of Analysis of Temporary Differences Giving Rise to Net Deferred Tax Liability (Detail) - MXN ($) $ in Thousands | 12 Months Ended |
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | $ 86,613,327 | $ 104,573,985 | $ 98,589,818 | $ 69,817,147
Deferred tax expense in net profit for the year | 1,994,063 | 5,151,492 | 18,285,052 |
Provisions [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | 20,781,421 | 26,268,666 |  |
Deferred tax expense in net profit for the year | 1,841,705 | 1,579,604 | 1,622,132 |
Deferred revenues [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | 6,866,120 | 7,461,802 |  |
Deferred tax expense in net profit for the year | 3,632,051 | (965,010) | (12,128) |
Tax losses carry forward [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | 27,881,491 | 38,332,408 |  |
Deferred tax expense in net profit for the year | (5,833,660) | (323,506) | 12,706,245 |
Property, plant and equipment [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | (11,756,590) | (9,929,129) |  |
Deferred tax expense in net profit for the year | 453,493 | 1,974,753 | 2,445,783 |
Inventories [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | 2,106,976 | 2,003,049 |  |
Deferred tax expense in net profit for the year | 81,270 | 519,046 | (229,571) |
Licenses and rights of use [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | (3,896,788) | (2,455,877) |  |
Deferred tax expense in net profit for the year | 961,402 | 348,201 | 54,182 |
Employee benefits [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | 33,673,874 | 33,253,071 |  |
Deferred tax expense in net profit for the year | 1,128,209 | 1,225,310 | 3,616,952 |
Other [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | 10,956,823 | 9,639,995 |  |
Deferred tax expense in net profit for the year | $ (270,407) | $ 793,094 | $ (1,918,543) |

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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2018-03-16 + Details
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