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Other Current and Non-current Liabilities - Summary of Other Non-current Liabilities (Parenthetical) (Detail) - MXN ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract]    
Non-current portion of tax payable $ 981 $ 1,498
Current portion of tax payable $ 590 $ 958