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Income Taxes - Summary of Reconciliation of Deferred Tax Assets and Liabilities, Net (Detail) $ in Thousands, $ in Millions | 12 Months Ended |  |  |
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Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($)
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |  |  |  |  |
Deferred Tax (Liability) Asset Beginning Balance | $ 88,074,856 | $ 86,613,327 | $ 104,573,985 |  |  |  |
Deferred tax benefit | 12,292,014 | (3,894,383) | 1,994,063 |  |  |  |
Translation effect | 375,105 | 2,047,915 | (8,854,010) |  |  |  |
Deferred tax benefit recognized in OCI | (26,472,481) | 8,838,714 | 2,013,480 |  |  |  |
Deferred taxes acquired in business combinations | (2,580,552) | (276,568) | (25,827) |  |  |  |
Hyperinflationary effect in Argentina | (5,385,865) | (5,254,149) | (4,907,151) |  |  |  |
Effect of adoption of IFRS 9 |  |  | 544,628 |  |  |  |
Effect of adoption of IFRS 15 |  |  | (8,725,841) |  |  |  |
Deferred tax (liability) asset ending balance | 66,303,077 | 88,074,856 | 86,613,327 |  |  |  |
Presented in the consolidated statements of financial position as follows: |  |  |  |  |  |  |
Deferred income tax assets |  |  |  | $ 115,370,240 | $ 5,783 | $ 106,167,897 | $ 111,186,768
Deferred income tax liabilities |  |  |  | (49,067,163) | $ (2,460) | (18,093,041) | (24,573,441)
Deferred tax assets and liabilities, net | $ 88,074,856 | $ 86,613,327 | $ 104,573,985 | $ 66,303,077 |  | $ 88,074,856 | $ 86,613,327

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- Definition Deferred income tax relating to components of other comprehensive income. + References No definition available. + Details
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- Definition Income tax relating to effect of IFRS 9. + References No definition available. + Details
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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_o&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_56&doctype=Standard -URIDate 2020-01-01 + Details
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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 2020-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_o&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_56&doctype=Standard -URIDate 2020-01-01 + Details
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