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Income Taxes - Schedule of Changes in Balance of Tax Loss Carryforwards (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Major components of tax expense (income) [abstract]    
Balance at beginning of the period $ 29,487 $ 27,452
Reserved (306)  
Additions 4,124 5,673
Usage of tax losses (1,385) (3,157)
Translation effect of beginning balances (1,979) (481)
Balance at end of the period $ 29,941 $ 29,487