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Accounts Receivable, Net - Disclosure of Aging of Past Due But Not Impaired (Days Outstanding) (Detail) - Trade receivables [member] - Financial assets past due but not impaired [member] - MXN ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial assets that are either past due or impaired [line items]    
Accounts receivable , past due but not impaired $ 2,074 $ 2,365
60-90 days [member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Accounts receivable , past due but not impaired 599 610
90-120 days [member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Accounts receivable , past due but not impaired 269 216
120+ days [member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Accounts receivable , past due but not impaired $ 1,206 $ 1,539