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Stockholders' Equity - Summary of Other Equity Reserves (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2016
Dec. 31, 2017
Disclosure of reserves within equity [abstract]      
Cumulative translation effect, net of effects from perpetual debentures and deferred income taxes recognized directly in equity (notes 19.2 and 20.4) $ 17,683 $ 21,288  
Cumulative actuarial losses (7,527) (10,931)  
Treasury shares repurchased under share repurchase program (note 20.1) (1,520) 0  
Effects associated with the Parent Company's convertible securities 3,427 3,427  
Treasury shares held by subsidiaries (194) (301)  
Other equity reserves $ 11,869 $ 13,483 $ 13,483