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Financial Instruments - Summary of Debt Summarized by Interest Rates and Currencies (Detail)
$ in Millions, $ in Millions
Dec. 31, 2017
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Dec. 31, 2014
MXN ($)
Disclosure of detailed information about financial instruments [line items]            
Short- term   $ 16,973   $ 1,222    
Long- term $ 9,892 177,022 $ 11,379 235,016    
Total   193,995   236,238 $ 229,343 $ 205,834
Floating interest rate [member]            
Disclosure of detailed information about financial instruments [line items]            
Short- term   7,282   519    
Long- term   53,389   64,550    
Total   $ 60,671   $ 65,069    
Short-term 6.10% 6.10% 9.70% 9.70%    
Long-term 3.00% 3.00% 4.40% 4.40%    
Fixed interest rate [member]            
Disclosure of detailed information about financial instruments [line items]            
Short- term   $ 9,691   $ 703    
Long- term   123,633   170,466    
Total   $ 133,324   $ 171,169    
Short-term 4.80% 4.80% 4.40% 4.40%    
Long-term 5.70% 5.70% 6.50% 6.50%    
US Dollar [member]            
Disclosure of detailed information about financial instruments [line items]            
Short- term   $ 6,206   $ 114    
Long- term   107,508   179,675    
Total   $ 113,714   $ 179,789    
Effective rate 5.90% 5.90% 6.30% 6.30%    
Euro [member]            
Disclosure of detailed information about financial instruments [line items]            
Short- term   $ 9,705   $ 50    
Long- term   54,906   55,292    
Total   $ 64,611   $ 55,342    
Effective rate 3.50% 3.50% 4.30% 4.30%    
Pounds [member]            
Disclosure of detailed information about financial instruments [line items]            
Short- term   $ 0   $ 0    
Long- term   9,141   0    
Total   $ 9,141   $ 0    
Effective rate 2.60% 2.60% 0.00% 0.00%    
Philippine pesos [member]            
Disclosure of detailed information about financial instruments [line items]            
Short- term   $ 0   $ 0    
Long- term   5,408   0    
Total   $ 5,408   $ 0    
Effective rate 4.60% 4.60% 0.00% 0.00%    
Pesos [Member]            
Disclosure of detailed information about financial instruments [line items]            
Short- term   $ 0   $ 648    
Long- term   0   0    
Total   $ 0   $ 648    
Effective rate 0.00% 0.00% 4.40% 4.40%    
Other Currencies [Member]            
Disclosure of detailed information about financial instruments [line items]            
Short- term   $ 1,062   $ 410    
Long- term   59   49    
Total   $ 1,121   $ 459    
Effective rate 6.20% 6.20% 10.20% 10.20%