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Bonus Programs - Additional Information (Detail) - MXN ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Percentage of bonus 50.00%    
Percentage of annual bonus 50.00%    
Compensation expense $ 610 $ 401 $ 351
Fair value of shares held by trust 488 468  
Top of range [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Percentage of economic value added 70.00%    
Bottom of range [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Percentage of economic value added 30.00%