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Income Taxes - Summary of Composition of Income Tax Expense (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2021
MXN ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Income tax expense $ 28,144,769 $ 1,367 $ 13,509,270 [1] $ 49,914,055 [1]
Mexico [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Current year income tax 24,355,240   13,407,948 26,295,431
Deferred income tax (5,079,397)   (9,334,246) 208,658
Income Tax attributable to a discontinued operation (26,294,422)   0 0
Foreign [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Current year income tax 23,412,990   12,319,690 19,830,227
Deferred income tax (14,544,064)   (2,884,122) 3,579,739
Income Tax attributable to a discontinued operation $ (2,571,541)   $ (2,856,882) $ (1,119,479)
[1] Restated for discontinued operations.