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Other Liabilities, Provisions, Contingencies and Commitments - Contingencies (Detail) - MXN ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial liabilities [line items]        
Provisions $ 6,303 $ 8,854    
Indirect taxes [member]        
Disclosure of financial liabilities [line items]        
Provisions 3,153 5,062 $ 5,421 $ 6,836
Labor [member]        
Disclosure of financial liabilities [line items]        
Provisions 1,857 2,455 2,601 2,723
Legal [member]        
Disclosure of financial liabilities [line items]        
Provisions $ 1,293 $ 1,337 $ 1,906 $ 3,296