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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | $ 88,074,856 | $ 86,613,327 | $ 104,573,985 | $ 98,589,818
Deferred tax expense in net profit for the year | (3,894,384) | 1,994,063 | 5,151,492 |
Provisions [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | 17,964,305 | 20,781,421 |  |
Deferred tax expense in net profit for the year | (257,070) | 1,841,705 | 1,579,604 |
Deferred revenues [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | 5,820,260 | 6,866,120 |  |
Deferred tax expense in net profit for the year | (1,077,259) | 3,632,051 | (965,010) |
Tax losses carry forward [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | 26,630,407 | 27,881,491 |  |
Deferred tax expense in net profit for the year | (9,873) | (5,833,660) | (323,506) |
Property, plant and equipment [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | (11,962,544) | (11,756,590) |  |
Deferred tax expense in net profit for the year | (461,594) | 453,493 | 1,974,753 |
Inventories [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | 1,787,065 | 2,106,976 |  |
Deferred tax expense in net profit for the year | (291,531) | 81,270 | 519,046 |
Licenses and rights of use [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | (3,399,931) | (3,896,788) |  |
Deferred tax expense in net profit for the year | 432,403 | 961,402 | 348,201 |
Employee benefits [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | 41,743,744 | 33,673,874 |  |
Deferred tax expense in net profit for the year | (1,019,042) | 1,128,209 | 1,225,310 |
Other [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | 9,491,550 | 10,956,823 |  |
Deferred tax expense in net profit for the year | $ (1,210,417) | $ (270,407) | $ 793,094 |

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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 2019-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2019-03-27 + Details
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