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Leases - Schedule of Company's lease liabilities (Detail)
$ in Millions, $ in Millions
Sep. 30, 2019
USD ($)
Sep. 30, 2019
MXN ($)
Jan. 01, 2019
MXN ($)
Disclosure of maturity analysis of operating lease payments [line items]      
Lease liabilities   $ 1,384 $ 1,797
Current $ 24 471  
Non-Current $ 46 913  
Less than one year      
Disclosure of maturity analysis of operating lease payments [line items]      
Lease liabilities   471  
One to three years      
Disclosure of maturity analysis of operating lease payments [line items]      
Lease liabilities   716  
More than three years      
Disclosure of maturity analysis of operating lease payments [line items]      
Lease liabilities   $ 197