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Subsequent Events - Additional Information (Detail) - MXN ($)
1 Months Ended 7 Months Ended
Nov. 01, 2019
Oct. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Disclosure of Taxable Income [line items]        
Cash dividend     $ 7,437,000,000 $ 7,038,000,000
Events after reporting [member]        
Disclosure of Taxable Income [line items]        
Percent of net interest deduction on adjusted taxable income   30.00%    
Amount of net interest deduction on adjusted taxable income   $ 20,000,000    
Non deductible interests that exceed the limitation carried forward period   10 years    
Excise tax per liter   1.17    
Excise tax rate   25.00%    
Cash dividend $ 3,722,000,000