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Income Taxes - Summary of Composition of Income Tax Expense (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2019
MXN ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Income tax expense $ 51,033,533 $ 2,708 $ 46,477,079 $ 24,941,511
Mexico [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Current year income tax 26,295,431   28,572,414 16,568,274
Deferred income tax 208,658   (2,688,727) 2,582,287
Foreign [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Current year income tax 20,843,720   19,898,728 13,524,729
Deferred income tax $ 3,685,724   $ 694,664 $ (7,733,779)