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Bank Loans and Notes Payables - Summary of Reconciliation of Liabilities Arising From Financing Activities (Parenthetical) (Detail)
$ in Millions, $ in Millions
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Current portion of long term debt $ 10,114 $ 515 $ 1,479  
Long term borrowings senior notes [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Current portion of long term debt       $ 2,496
Brazil, Brazil Real [member] | Long term bank loans [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Current portion of long term debt     636 177
Brazil, Brazil Real [member] | Long term notes payable [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Current portion of long term debt     10  
Brazil, Brazil Real [member] | Bank loans [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Current portion of long term debt 602   636  
Brazil, Brazil Real [member] | Notes payable [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Current portion of long term debt 10   10  
Brazil, Brazil Real [member] | Capital leases [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Current portion of long term debt       67
Argentina, Pesos [member] | Long term bank loans [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Current portion of long term debt     40 100
Argentina, Pesos [member] | Bank loans [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Current portion of long term debt     40  
Colombia, Pesos [member] | Long term bank loans [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Current portion of long term debt       $ 246
Colombia, Pesos [member] | Bank loans [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Current portion of long term debt 728   793  
Colombia, Pesos [member] | Capital leases [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Current portion of long term debt     $ 793  
United States of America, Dollars [member] | Senior notes 1 [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Current portion of long term debt $ 8,774