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Other Expenses, Net - Summary of Other Expenses (Parenthetical) (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Material income and expense [abstract]        
Income tax penalty imposed   $ 491 $ 25  
Property damages and natural disasters $ 1,080      
Impairment losses of fixed assets 445 984   $ 1,899
Impairment losses of goodwill 0 $ 1,920   $ 0
Loss on valuation of assets held for sale $ 439