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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, 2020 MXN ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Income tax expense | $ 16,366,152 | $ 820 | $ 51,033,533 | $ 46,477,079
Mexico [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Current year income tax | 13,407,948 |  | 26,295,431 | 28,572,414
Deferred income tax | (9,334,246) |  | 208,658 | (2,688,727)
Foreign [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Current year income tax | 15,250,218 |  | 20,843,720 | 19,898,728
Deferred income tax | $ (2,957,768) |  | $ 3,685,724 | $ 694,664

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