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Income Taxes - Schedule of Deferred Income Tax (Parenthetical) (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
 [1]
Dec. 31, 2017
MXN ($)
Disclosure of income taxes [Line Items]      
Deferred tax recovery period 10 years    
Deferred tax liability $ 5,886 $ 300 $ 6,133
Venezuela [member]      
Disclosure of income taxes [Line Items]      
Deferred tax liability $ 1,107    
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3