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Income Taxes - Summary of Composition of Income Tax Expense (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Income tax expense $ 46,477,079 $ 2,361 $ 24,941,511 $ 11,398,856
Mexico [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Current year income tax 28,572,414   16,568,274 14,316,005
Deferred income tax (2,688,727)   2,582,287 (12,086,232)
Foreign [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Current year income tax 19,898,728   13,524,729 15,367,903
Deferred income tax $ 694,664   $ (7,733,779) $ (6,198,820)