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Other Liabilities, Provisions and Contingencies - Summary of Nature and Amount of Loss Contingencies Recorded (Detail) - MXN ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Disclosure of other provisions [line items]    
Provisions $ 7,927 $ 8,298
Tax [member]    
Disclosure of other provisions [line items]    
Provisions 4,653 5,038
Labor [member]    
Disclosure of other provisions [line items]    
Provisions 2,332 2,340
Legal [member]    
Disclosure of other provisions [line items]    
Provisions $ 942 $ 920