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Income Taxes - Summary of Composition of Income Tax Expense (Detail) $ in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2023 MXN ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 MXN ($) | Dec. 31, 2021 MXN ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Income tax expense | $ 34,544,003 | $ 2,045 | $ 46,044,089 | $ 32,717,477
Mexico [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Current year income tax | 32,327,958 |  | 29,865,043 | 24,355,240
Deferred income tax | (6,706,412) |  | 3,454,279 | (5,079,397)
Income Tax attributable to a discontinued operation | 0 |  | 0 | 26,294,422
Foreign [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Current year income tax | 16,026,324 |  | 17,634,494 | 23,397,577
Deferred income tax | (7,103,867) |  | (4,909,727) | (9,955,943)
Income Tax attributable to a discontinued operation | $ 0 |  | $ 1,805,500 | $ 7,144,249

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