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Financial Instruments - Disclosure of Outstanding Cross Currency Swap Agreements (Detail) - Cross-currency swaps [member] - MXN ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Less than 1 year [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount $ 4,738 $ 24,760
Fair Value Liability   (3,878)
Fair Value Asset 502  
1-2 years [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 18,126 6,263
Fair Value Liability (378) (205)
Fair Value Asset 1,015  
2-3 years [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 4,774 18,428
Fair Value Liability   (927)
Fair Value Asset 615 567
4-5 years [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 396  
Fair Value Liability (7)  
Later than seven years and not later than eight years [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 23,948  
Fair Value Liability (396)  
Fair Value Asset 7,818  
8-9 years [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 813 888
Fair Value Liability (154) (192)
9-10 years [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 6,889 6,907
Fair Value Liability (42)  
Fair Value Asset $ 202 51
3-4 years [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount   4,853
Fair Value Liability   (12)
Fair Value Asset   24
5-6 years [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount   14,446
Fair Value Asset   $ 8,336