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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, 2023 MXN ($) | Dec. 31, 2022 MXN ($) | Dec. 31, 2021 MXN ($) | Dec. 31, 2023 USD ($)
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |  |
Deferred Tax (Liability) Asset Beginning Balance | $ 98,415,751 | $ 77,822,839 |  |
Deferred tax benefit | 13,810,280 | 1,455,448 |  |
Translation effect | 3,202,557 | (1,644,500) |  |
Deferred tax benefit recognized in OCI | 1,861,305 | 10,985,695 | $ (4,176,197) |
Deferred taxes acquired in business combinations | (529,191) | (11,571) |  |
Hyperinflationary effect in Argentina | (146,182) | (942,751) |  |
Disposals (Note 2Ac) | 0 | (3,856,459) |  |
Spin-off | 0 | 14,607,050 |  |
Related discontinued operation | 0 | 0 |  |
Deferred tax (liability) asset ending balance | 116,614,520 | 98,415,751 | 77,822,839 |
Presented in the consolidated statements of financial position as follows: |  |  |  |
Deferred income tax assets | 137,883,622 | 128,717,811 |  | $ 8,162
Deferred income tax liabilities | (21,269,102) | (30,302,060) |  | $ (1,259)
Deferred tax assets and liabilities, net | $ 116,614,520 | $ 98,415,751 | $ 77,822,839 |

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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 2023-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 54 -Subparagraph o -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_o&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 56 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_56&doctype=Standard -URIDate 2023-03-23 + Details
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