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Financial Instruments - Disclosure of Outstanding Interest Rate Swap Agreements (Detail) - Interest rate swap [member] - MXN ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
1-2 years [member]    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount $ 4,032 $ 4,089
Fair Value Liability (49) (35)
2-3 years [member]    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount 4,559 3,669
Fair Value Liability (112) (17)
3-4 years [member]    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount 4,548 3,709
Fair Value Liability (151) (103)
4-5 years [member]    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount 617 875
Fair Value Liability (18) (34)
Later than 5 years [member]    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount 13,101 13,328
Fair Value Liability (49) (77)
Fair Value Asset $ 1,143 $ 984