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Other Liabilities, Provisions and Contingencies - Additional Information (Detail)
$ in Millions, $ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
MXN ($)
Disclosure of contingent liabilities [line items]        
Other current financial liabilities   $ 566 $ 222 $ 4,385
Aggregate amount claimed against company $ 54,182      
Tax contingencies amount       50,729
Provisions other non current liabilitites and other non current financial liabilities   10,804   10,271
Other Current Financial Liabilities [Member]        
Disclosure of contingent liabilities [line items]        
Dividends to be paid       3,722
Brazil [member]        
Disclosure of contingent liabilities [line items]        
Litigation amount $ 8,985 $ 7,739    
Value added tax [member]        
Disclosure of contingent liabilities [line items]        
Tax contingencies amount       10,451
Value added tax [member] | State of Sao Paulo [member]        
Disclosure of contingent liabilities [line items]        
Tax contingencies amount       3,174
Tax credits [member]        
Disclosure of contingent liabilities [line items]        
Tax contingencies amount       33,383
Federal taxes [member]        
Disclosure of contingent liabilities [line items]        
Tax contingencies amount       $ 3,719