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Income Taxes - Summary of Composition of Income Tax Expense (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Income tax expense $ 24,941,511 $ 1,261 $ 11,398,856 $ 19,179,651
Mexico [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Current year income tax 16,568,274   14,316,005 17,156,638
Deferred income tax 2,582,287   (12,086,232) (4,095,128)
Foreign [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Current year income tax 13,524,729   15,367,903 17,775,360
Deferred income tax $ (7,733,779)   $ (6,198,820) $ (11,657,219)