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Trade Accounts Receivable, Net - Disclosure of Aging of Accounts Receivable (Days Current or Outstanding) (Detail) - Trade receivables [member] - Financial assets past due but not impaired [member] - MXN ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial assets that are either past due or impaired [line items]    
Accounts receivable , days current or outstanding $ 30,278 $ 33,691
Current [member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Accounts receivable , days current or outstanding 22,789 25,537
0-30 days [member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Accounts receivable , days current or outstanding 4,081 5,009
31-60 days [member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Accounts receivable , days current or outstanding 869 838
60-90 days [member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Accounts receivable , days current or outstanding 598 398
90-120 days [member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Accounts receivable , days current or outstanding 241 383
120+ days [member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Accounts receivable , days current or outstanding $ 1,700 $ 1,527