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Bank Loans and Notes Payables - Additional Information (Detail) - MXN ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Disclosure of detailed information about borrowings [line items]      
Fixed interest rate 9.09%   8.63%
Long-term debt $ 75,924 $ 80,423  
Mexico, Pesos [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 9,400    
Colombia, Pesos      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,471    
Argentina, Pesos      
Disclosure of detailed information about borrowings [line items]      
Long-term debt $ 1,471