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Financial Instruments - Disclosure of Outstanding Interest Rate Swap Agreements (Detail) - Interest rate swap [member] - MXN ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
1-2 years [member]    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount $ 4,089  
Fair Value Liability (35)  
2-3 years [member]    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount 3,669 $ 77
Fair Value Liability (17) (4)
3-4 years [member]    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount 3,709  
Fair Value Liability (103)  
4-5 years [member]    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount 875 727
Fair Value Liability (34) (87)
5-6 years [member]    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount 13,328 929
Fair Value Liability (77) (35)
Fair Value Asset $ 984  
Less than 1 year [member]    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount   1,250
Fair Value Asset   10
6-7 years [member]    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount   13,261
Fair Value Liability   (73)
Fair Value Asset   $ 1,028