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Income Taxes - Summary of Composition of Income Tax Expense (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
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